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Roadmaster Battery Charge Line Kit for Towed Vehicles

Roadmaster Battery Charge Line Kit for Towed Vehicles

Item # RM-156-25
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RM-156-25 - Battery Charge Line Kit Roadmaster Accessories and Parts
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Kit allows up to 15 amps from your RV's battery to be used to maintain the charge of your towed car's battery while the car is being towed. Charge line connects to the 6-way or 7-way plug on your vehicle. Requires separate charge line in RV. Call 800-298-8924 to order Roadmaster accessories and parts part number RM-156-25 or order online at etrailer.com. Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster Battery Charge Line Kit for Towed Vehicles. Accessories and Parts reviews from real customers.
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Roadmaster Accessories and Parts - RM-156-25

  • Tow Bar Wiring
  • Battery Charge Line Kit
  • Roadmaster

Kit allows up to 15 amps from your RV's battery to be used to maintain the charge of your towed car's battery while the car is being towed. Charge line connects to the 6-way or 7-way plug on your vehicle. Requires separate charge line in RV.


Features:

  • Maintains the battery charge in your towed vehicle while the car is being towed
    • Provides just 15 amps to avoid overcharging
  • Connects battery to 6-way or 7-way plug at the front of your towed car
  • Receives power from your RV
    • Requires Roadmaster's motor home battery line (RM-156-75 - sold separately) if no charge line is present in your RV
  • Includes 14-guage wire, split wire loom, circuit breaker, and hardware
  • Made in the USA
  • Limited Lifetime Warranty


156-25 Roadmaster Battery Charge Line Kit for Towed Vehicles





Video of Roadmaster Battery Charge Line Kit for Towed Vehicles

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Roadmaster Tow Bar Wiring RM-156-25 Review

Speaker 1: Today we're going to take a look at the Roadmaster Battery Charged Line Kit for towed vehicles. Now this kit will allow up to 15 amps from your RV's battery to be used to maintain the charge of your towed car's battery while the car is being towed, and it does provide just 15 amps to avoid overcharging. This will connect the battery to your 6-way or 7-way plug at the front of your towed car. Receives the power from your RV, so it does require a separate charge line. Now if there's no charge line present in your RV, it will require Roadmaster's Motor Home Battery Line, which is part number RM-156-75, which we do sell separately on our website, and is listed on this product page as a related product.This part will include everything laid out here on the table. The 14 gauge wire, the split wire loom, the circuit breaker, all the hardware and connectors to hook it up, a couple of cable ties to take up any slack in the wiring, and even a nice set of detail installation instructions on how to install everything.

This part is made in the U.S.A. That should do it for the review on the Roadmaster Battery Charged Line Kit for towed vehicles.


Customer Reviews

Roadmaster Battery Charge Line Kit for Towed Vehicles - RM-156-25

Average Customer Rating:  4.7 out of 5 stars   (106 Customer Reviews)

Kit allows up to 15 amps from your RV's battery to be used to maintain the charge of your towed car's battery while the car is being towed. Charge line connects to the 6-way or 7-way plug on your vehicle. Requires separate charge line in RV.

- RM-156-25
by:

I have a battery charger cable from my RV to the towed car. My battery is in the rear so the instructions state I can attach the wires to the battery connector points up front. But then it says to attach the charger thing as close to the battery as possible. Question - Do I put the charging thing in the rear or the front 582538


Comments
According to Roadmaster, its best to install the circuit breaker which is the small box with the two terminals on it that I believe you were referring to as close as possible to the battery.
-- Mike L - 11/15/2018

45748

- RM-156-25
by:

I installed this baseplate on my 2003 Honda CRV myself. It was a challenge for an inexperienced mechanic but successful in spite of that. Following the clear instructions, the unit fit well into the CRV chassis. Installing it myself has also given me confidence in towing that I may not have had by giving that task to someone else. I wired the CRV and RV 6 way and 7 way connectors including power to charge the CRV's battery while towing. After towing the car for several thousand miles, I am very satisfied with the base plate, tow bar, and installation. 681269



- RM-156-25
by:

The product was exactly what I needed to keep the battery of my towed vehicle charged and it was very easy to install.I would recommend it for everyone that has a motor home and a tow vehicle. 544210



- RM-156-25
by:

this does not isolate your battery from feeding back into your motorhome, this is simple a circuit breaker with a piece of wire and connectors. if it was a real kit it should have a protective diode to insure issues in the towed vehicle do not interfere with the charging system in your motorhome, as it is this is just a jumper between the alternator/battery in the motorhome and the alternator/battery in your towed vehicle. 477658



- RM-156-25
by:

Ordered 3 parts: RM-156-25; RM-156-75 and DW05745-10. All received very quickly, as is the case when I purchase from etrailer. More importantly, I get a 'live person' when I call for assistance and the service rep. is always knowledgable ( not an answering service that "will have someone call back". Time was spent with me answering all my questions and providing suggestions and opinions when I as for them, related to my project. Great company, great service - keep up the great work! 693892



- RM-156-25
by:

OK...did the job, but kit should include diode block. 682693



- RM-156-25
by:

I ordered all the parts required to safely flat tow out 2017 Jeep Cherokee Trailhawk from etrailer.com. The only part they didn't have was the Mopar Flat Tow Enhancement kit Jeep requires to flat tow this model. Ordering from them was great, the website is easy to use and I was able to locate all the pieces compatible with my specific vehicle. The expert recommendations help my decision choosing the right parts. I ordered from etrailer even though I found some of the parts on other websites a little cheaper. I chose to pay a little more because of all the effort etrailer has put into installation videos and guides. I was very pleasantly surprised to learn from etrailer that they have a price match guarantee! So my equipment consisted of the following Mopar Flat Tow Enhancement Kit (from Jeep) Roadmaster Battery Charge Line Kit for Towed Vehicles Mighty Cord 7-Way RV Style Trailer Connector - Trailer End WesBarg 7-Way, RV-Style Connector w/ 6' Long Coiled Cable Trailer End Pollak Black Plastic, 7-Pole, RV Blade-Style Trailer Socket - Vehicle End Hopkins Custom Tail Light Wiring Kit for Towed Vehicles SMI Stay-IN-Play DUO Supplemental Braking System Roadmaster Brake-Lite Relay Kit for Towed Vehicles Blue Ox Alpha Tow Bar - Motor Home Mount - 6,500 lbs Blue Ox Base Plate Kit - Removable Arms Blue Ox Tow Bar Cover - Aladdin, Aventa LX, Aventa II The installation videos are great but not all inclusive. Take the time to read the instructions that come with the parts. This is a major project, I took about 30 hrs over a full week but as you'll see in the pictures I took s few extra steps to make a cleaner look. Some of those extra steps: The base plate install requires the bumper be modified cutting off a flange on each side, I spray painted this to prevent corrosion. In the install video of the baseplate on the drivers side they use an extra quick link (not included) to run the safety cable around the wiper fluid reservoir. I took the time to remove it and run the safety cable behind it. I didn't want our nice new vehicle to look like it can be towed so I played the brake away switch and 7 way trailer plug behind the license plate, so when not being towed our vehicle looks great! Some things to be aware of. The Brake air cylinder that mounts to the brake pedal with four bolts may need longer bolts, it did on our Jeep. Spend the money for weather tight heat shrink crimp fittings. The Hopkins wire harness was about 1.5 feet short to get to my plug location. Buy extra zip ties, electrical tape and split loom. I recommend reading all the various installation manuals and watching all the videos because the various components integrate together and if you install one at a time you'll be doing a bunch of extra work. The brake light relay is a real pain in the butt, not because of the hardware but because of the location of the brake light switch which is very hard to get to. Overall I am very happy with the products and how the installation looks. We haven't towed it yet but do not expect any problems. 410271


Comments
Still very happy with our purchase. We’ve towed over 10k miles and have had zero issues with our tow setup. I’ve shared my experience with several other RVrs and recommended your company for their needs. Thank you,
Roy - 07/30/2018

41667

- RM-156-25
by:

So happy to have found this product. It will keep my Dinghy tow car battery charged up. The people at etrailer were very nice and helpful. 675094



- RM-156-25
by:

I bought and installed base plate and wiring on a 2018 Ford C-Max hybrid car. The wiring was a little complicated due to the hybrid setup on the car, however, everything worked out well. I have done this on several other cars I have towed behind my motorhomes. All products and help from etrailer.com was excellent. The video presentation was very helpful. 681635



- RM-156-25
by: 10/17/2020

899934



- RM-156-25
by:

The video and instruction sheet were very helpful. The installation went well except the red wire provided was a bit too short for the installation in my 2018 Chevy Equinox. I spliced in some available wire. 897152



- RM-156-25
by:

Works well, battery stays charged on long tow days. 893010



- RM-156-25
by:

had ex a call what I needed and very fast shipping. 892648



- RM-156-25
by:

I really like the way this base plate installed. Everything fit perfect and I like the look once it was completed. It's a snap to hook up with room for error. Our Jeep pulls like it's not even there. 898523



- RM-156-25
by:

Delivery on time and accurate. 895360



- RM-156-25
by:

This part was a suggestion, made by your sales rep to me. I followed their advice and it works perfect I would not be caught without it. 875941



- RM-156-25
by:

Kit arrived in a couple of days and was easy to install. etrailer is always helpful with questions. 874728



- RM-156-25
by:

Arrived quick waiting for base-plate and other parts to be delivered before opening. 871380



- RM-156-25
by:

867395



- RM-156-25
by: 08/20/2020

This charge line kit has kept my Honda CR-V battery charged while under tow. The key must be turned to the unlock position so that the shift lever can be moved to neutral. This leaves accessories such as the GPS turned on. The charge line kit keeps my battery charged regardless of this drain on my battery. 865074



- RM-156-25
by:

The wires is too short 863028



- RM-156-25
by:

works as advertised. pretty easy to ins tall 857696



- RM-156-25
by: 08/06/2020

857152



- RM-156-25
by:

I needed this fast for an upcoming trip. eTrailer had it in stock and got it to me quick. I used this to run from my toad's motorhome 6-pin feed receptacle to the toad battery to keep the battery charged (my Blue Ox Patriot brake gets power from the toad 12v plug). I towed it 1400 miles and it kept my battery at full charge! It came with all the parts needed, however the provided wire was JUST enough to run from below my Wrangler's bumper up to the battery. If your vehicle has a longer run to the battery, you may need to buy some extra 14g red wire, but its widely available at hardware stores. My Wrangler's thick steel engine compartment sidewall proved too much for the "self-tapping" screws provided for the circuit breaker, but I just drilled pilot holes with a standard bit. Instructions were very clear and installation was a breeze. 855979



- RM-156-25
by:

Works great! 850156


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Show More Reviews

Ask the Experts about this Roadmaster Accessories and Parts

  • How to Keep Battery Charged While Flat Towing a 2015 Fiat 500
    Great question! From what I could find in the owner's manual for a 2015 Fiat 500 (looking both at the Recreational/Flat Towing and Emergency Towing procedures) it does look like you need to keep the steering wheel unlocked while flat towing. Since this means your ignition is on, it can very well drain your battery. I'm not sure why this isn't something that is commonly known because even some of our flat towing manufacturers don't have this info on their site. I reached out to Roadmaster...
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  • Recommended Charge Line for Toad Behind Motorhome
    The battery of your 2015 GMC Yukon must be disconnected to protect your electronics when towing. If your supplemental braking system uses power, then I recommend the Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 on your vehicle. If you don't have the charge line on your 7-way or 6-way of your motorhome, then I recommend # RM-156-75 for that charge line kit. To make disconnecting and reconnecting your Yukon battery easy, I recommend the Roadmaster Automatic Battery...
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  • How to Install Battery Charge Line Kit on 2018 Chevy Equinox While Using Blue Ox Patriot II
    While I can't give you a definitive answer as to how your shop chose to wire in the 12V accessory plug on the dash of your 2018 Chevy Equinox, I can say that it is highly unlikely that it's wired up to the 12V center pin on your 6-Pole connector. Typically, a 12V outlet like # RM-9332 is wired to the vehicle battery through a fuse box, as shown in the included installation video at the bottom of the page. This allows the Blue Ox Patriot II # BRK2016 to be powered by your vehicle's battery,...
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  • Troubleshooting Battery Charge Line Kit on 2018 Jeep Cherokee
    I can assume you are using the recommended Roadmaster Battery Charge Line Kits # RM-156-25 for towed vehicles and # RM-156-75 for motor homes. I've added links to installs of these kits for you to refer to so you can ensure your install followed the same process. If by "switched" or "unswitched" you are asking if the 12 volt circuit turns off when you turn off your RV, then it seems as if it is not switched. You will want to disconnect your 2018 Jeep Cherokee from your RV when you are...
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  • Does the Roadmaster Battery Charge Line Kit for Towed Vehicles Need Grounded
    The Roadmaster Battery Charge Line Kit for Towed Vehicles part # RM-156-25 does not require any additional ground. In regards to the trailer connector on the tow vehicle or toad vehicle these will both be grounded as will the batteries that the charge line connects to. In order to bridge the charge line from the motorhome to the toad, the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit part # RM-15267 is my recommendation since there is an extra pin present to use for the charge line.
    view full answer...
  • Is a Charge Line Kit Needed on a 2014 Honda CR-V if the ACC Fuse is Pulled for Flat Towing
    Unless you are using a supplemental braking system like the Blue Ox Patriot II # BRK2016 which draws power from a 12V outlet like part # RM-9332 then you would need the Charge Line Kit # RM-156-25 when the ACC fuse is pulled on your 2014 Honda CR-V. If you were to install the charge line kit you wouldn't need to pull the ACC fuse or it would act as a safeguard in case you did forget to pull that fuse. For a complete flat towing setup you will need a base plate kit, tow bar, safety...
    view full answer...
  • Troubleshooting Charge Line Kit Not Working When Flat Towing a 2017 Subaru Crosstrek
    What you are describing sounds like the 15A circuit breaker that comes with the Charge Line Kit # RM-156-25 is shot. This can easily be replaced with another circuit breaker like the 20A # 9506P but since your kit is only a year old it would be good to check your wiring as well as these shouldn't go out that quick. Check to make sure that all of the wiring looks good and it isn't exposed. If you do see that some of the wiring is damaged or exposed and you need replacement wire then we...
    view full answer...
  • Installing Battery Charge Line To Power Tow Vehicle
    The Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 and the Roadmaster Battery Charge Line Kit for Motor Homes # RM-156-75 will allow you to power your tow vehicle through a 6-way or 7-way wiring connection between vehicles. If you want a separate connector you can run a cord for that, but most people use the 12V pin or another unused pin and the 7 to 6-way cable to power their connection using a cord like the Roadmaster 7-Wire to 6-Wire Straight Cord Kit - 6-1/2' Long...
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  • Do I Need A Charge Line From Motorhome To Flat Tow 2019 Chevy Equinox?
    You do not want to pull any fuses in the 2019 Chevy Equinox when you flat tow and you do want to keep the battery connected. In the past there has been issues with extreme wobble when flat towing an Equinox because of pulling the fuse for the body control module. According to the owner's manual of the 2019 Chevy Equinox you will need to keep the battery connected and use a charge line from the motor home. For that I recommend Roadmaster Battery Charge Line part # RM-156-25. If there is...
    view full answer...
  • Installing Roadmaster Battery Charge Line Kit on 2018 Jeep Cherokee
    It sounds like you are referring to the Roadmaster Battery Charge Line Kit # RM-156-25 for your 2018 Jeep Cherokee. This kit allows you to connect your Jeep's battery to the 6-Way or 7-Way plug at the front of the vehicle so that up to 15 amps from the RV's battery can be used to maintain its charge while being towed. If no charge line is present in your RV, you will also need to add the Motor Home Charge Line Kit # RM-156-75. For the charge line kit, you will attach the included length...
    view full answer...
  • Will Roadmaster Battery Charge Line Kit Overcharge Battery
    The Roadmaster Battery Charge Line Kit # RM-156-25 provides up to 15 amps of power which is perfect for maintaining the battery on your Jeep but it's not enough that you ever need to worry about it being overcharged. The kit does feature a circuit breaker to help isolate the circuit from issues but it won't by itself prevent back-feeding. This isn't typically a concern with this kind of setup but if you wanted extra peace of mind you would just need to add a single diode like # RM-690...
    view full answer...
  • Does the 2020 Ford Escape Hybrid Require the Use of a Charge Line Kit While Being Flat Towed
    According to my source at Roadmaster, the 2020 Ford Escape Hybrid does not require a battery charge line kit like the # RM-156-25 when being flat towed by an RV, and there are no fuses that are required to be removed. Adding a charge line kit would likely cause issues with the battery system on your hybrid vehicle so we do not recommend this application.
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  • Installing Battery Charge Wire Kit For Motorhome and Towed Vehicle Connection
    The Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 should be installed to the center port of the 6-way trailer connection. If you have a different connection, let me know as most charge kits have this 6 wire connector on the towed vehicle and a 7-way on the motorhome. If you don't already have the charge line for your motorhome, then you will want to use the Roadmaster Battery Charge Line Kit for Motor Homes # RM-156-75 which will have you connect the new wire to...
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  • Is Charge Line Needed For 2015 Chevy Equinox When Using Ready Brute Elite Tow Bar Braking System
    Since the Ready Brake system on your Ready Brute Elite Tow Bar just uses weight/momentum to pull the brake pedal in the vehicle down when stopping (and not any power from the battery) it is not necessary to add a charge line kit. You certainly still could just for peace of mind, in which case the Roadmaster # RM-156-25 would work perfectly, but it's definitely not required. Just keep in mind that you will still want to pull the appropriate fuses as listed in the owner's manual for your...
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  • How to Keep Power to Braking System When Pulling Fuse to Flat Tow 2016 Chevy Equinox
    You do not need to pull fuse 32 if you have a 4-cylinder 2016 Chevy Equinox; if so, leave fuse #32 intact and pull the ABS fuse instead (some models may label ABS fuse as #15 or #16). However, you will still lose power so you are going to need to install Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 and 12 Volt Outlet Kit # RM-9332. I have added a link to a video install of these kits on a '16 Equinox for you to take a look at. Additionally, if you do not have a charge...
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  • Can Battery Charge Line Kit be Used With 2020 Chevy Equinox Premier
    The Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 will not hurt the battery of your 2020 Chevy Equinox Premier; it is compatible with your AGM battery. Also, please keep in mind you will also need the Roadmaster Battery Charge Line Kit for Motorhomes # RM-156-75 if your motorhome does not already have a working 7-way. I have added a link to installs for you to take a look at as well. The rest of the parts needed to flat tow your '20 Equinox are as follows: - Base...
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  • How To Fix Dead Battery On 2013 Ford Edge After Being Towed
    If you are having issues with the battery dying during transit on a 2013 Ford Edge then I recommend adding a charge line, the Roadmaster Battery Charge Line Kit for Towed Vehicles part # RM-156-25. That said, in regards to the Roadmaster Automatic Battery Disconnect part # RM-766, I cannot recommend this. There are certain instances in which there does need to be power reaching devices on the vehicle while in tow. If you wish to use the battery disconnect you would need to do so on your...
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  • Which Direction Should Diode of Roadmaster RM-156-25 Battery Charge Kit Get Wired
    The correct way to wire up the breaker that comes with the Roadmaster charge line kit part # RM-156-25 is to have the copper post ran to the positive post of the battery that is charging the other vehicle and the silver side to the battery that is getting charged
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  • What Gauge Wire Is In Roadmaster Battery Charge Line Kit for Towed Vehicles
    Yes, 14 gauge is correct. The Roadmaster Battery Charge Line Kit for Towed Vehicles part # RM-156-25 comes with 14 gauge wire.
    view full answer...
  • Parts Needed to Charge Battery of Towed Vehicle while Flat Towing
    I have exactly what you are looking for, but the ease of install can be a bit of a loaded question. If you are comfortable dealing with trailer wires such as the occasional splicing or battery terminal connection, then this install will be easier than falling asleep in a La-Z-Boy recliner. If you've never touched a trailer wire before, then I've attached a video that will hopefully put your mind at ease that you can do this yourself. This can definitely be a DIY type of installation. To...
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  • Why Does the Key Need to be Turned to ACC/ACCESSORY When Flat Towing a 2014 Chevy Spark
    The reason that you need to turn the key to ACC/ACCESSORY when flat towing your 2014 Chevrolet Spark is so that the steering wheel will be unlocked. Otherwise the steering wheel will be locked and you will ruin your vehicle. It will cause your battery to slowly drain, but you can install a Roadmaster Battery Charge Line Kit # RM-156-25 on your Spark to help maintain the battery charge level while it is being flat towed. You can run the wire from the charge line kit to the center pin...
    view full answer...
  • How To Prevent the Battery From Draining While In Tow on a Nissan Frontier
    I spoke to my contact at Roadmaster who is considered by most to be the leader in flat-towing equipment and information. They informed me that you can prevent the battery drain issue you are having by installing a change line on your Nissan Frontier with the Roadmaster Battery Charge Line Kit for Towed Vehicles part # RM-156-25. If your motorhome doesn't have an active 12 volt pin on the 7-way then you will also need the Roadmaster Battery Charge Line Kit for Motorhomes part # RM-156-75....
    view full answer...
  • Which Pins to Use for Charge Wire of # RM-156-25 When Attaching to Trailer Connector
    The center pin of a 6-way is typically the 12 volt accessory circuit which is commonly used for charging batteries. The same 12 volt pin on a 7-way is the one in the 1:00 position. Between the two connectors styles those are the correct pins to use.
    view full answer...
  • Solution for Preventing Vehicle's Battery From Draining Due to Draw of Blue Ox Patriot Braking
    We have the part # RM-156-25 which allows you to run a charge wire from the vehicle towing your Equinox to keep the battery topped off. This will offset the amperage draw that the Blue Ox patriot puts on the system to operate. I attached an install video for this kit on a similar 2016 Equinox for you to check out as well.
    view full answer...
  • Installing Battery Charge Line on Motorhome and Towed Vehicle to Maintain Dinghy Battery
    The Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 is a great help for your 2012 Honda CR-V especially because your Patriot brake unit will be drawing power. To utilize this you will need power from your motorhome as well using the Roadmaster Battery Charge Line Kit for Motorhomes # RM-156-75. Since you only have a 4-way on your motorhome and vehicle, you will need a different connection. I recommend using the Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector...
    view full answer...
  • Will Flat Towed Vehicle Charge Line Kit Prevent Back-Feed and Overcharging?
    The Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 has a circuit breaker to help isolate that circuit from issues, but it will not prevent back-feeding. If you want to prevent back-feeding which isn't typically an issue, you can use the Roadmaster Single Park Light Diode # RM-690. Because you are sharing power between two batteries at a low amperage there is very little risk of a surge issue. Another option is to use the Tow Ready Battery Isolation Solenoid # TR118665...
    view full answer...
  • Recommended Wire Gauge and Related Parts to Install 12V Battery Charge Line on 7-Way
    We recommend at minimum a 14-gauge wire for providing 12V charging power to a towed vehicle's battery, such as that included in the Roadmaster Battery Charge Line Kit for Towed Vehicles, item # RM-156-25. Naturally, a heavier-gauge wire would do better since it can deliver more current. If you prefer you can use 10-gauge wire # 10-1-1, a 40-amp auto-reset breaker like # PK54540, ring terminals # 44-5310A and wire loom # 7509-10 to make your own kit. You can avoid tripping the breaker...
    view full answer...
  • Battery Charge Kit for Flat Towing Vehicle and Keeping Battery Topped Off
    Roadmaster has the battery charge kit part # RM-156-25 which will help keep your Jeep Cherokee's battery topped off as you flat tow it. Basically this kit provides a circuit from the 12 volt pin of the tow vehicle's wiring and then runs it to the positive post of the battery.
    view full answer...




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