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Roadmaster Battery Charge Line Kit for Towed Vehicles
(1489 reviews)
Price: $44.78
In Stock
Roadmaster
Roadmaster Battery Charge Line Kit for Towed Vehicles
Part Number: RM-156-25
In Stock
$44.78
Retail:$63.00
You Save: 29%
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- All Info
- Reviews (1489)
- Q & A (0)
- Videos (7)
- Photos
- Used (1)
Roadmaster Accessories and Parts - RM-156-25
- Flat Tow Wiring Harness
- 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-gauge 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
Installation Details
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 How to Install the Roadmaster Battery Charge Line Kit for Towed Vehicles on a 2012 Ram 1500
Hello Ram owners standard 2012 Ram 1500, we're going to be taking a look at and showing you how to install Roadmasters Charge Line Kit, and your Charge Line Kit. You really don't even see it installed on your vehicle. It integrates into your existing diode wiring. So, you'll have to already have a connector here at the front to attach your Charge Line too our connector here at the front is a six pole connector. This is the most common connector type for a flat tow setup. It's putting a six pole here at the front.
You'll need four poles just for all of your lighting circuits. So, a six pole we'll give you two additional circuits for adding accessories. A Charged Line Kits, one of the most common and your motorhomes are typically wired for them already. And usually when you plug in an umbilical, like a seven to six connector into your motorhome, that seven way end on your motorhome, we'll send a charge circuit down to the center pin here on your six pole. So, we're going to wire our fueled wire, to your Charge Line Kit into that center pole to be able to get your voltage trickle charging your battery from your motorhome.
And so whenever you're driving your motorhome, the motorhome's charging system, y'all made around there. It's going to put out a higher voltage than what our battery is, pushing some in there and keeping it topped off. So, when we reach our destination, no matter how long we're driving, cause there's some of you guys out there like to put in the hours and maybe do a six to eight hour trip. Some vehicles could discharge over the course of six to eight hours, depending on how much the braking systems drawing and any loads that may be present when the vehicles in flat tow. So, a Charge Line circuit, like this is going to ensure that battery stays topped up and you never have to worry about hearing that clicking noise.
When you get to your spot and realizing you can't take this vehicle. So, has our charge line circuit looks like under the hood here, we've got circuit protection included with the kit to ensure that we're going to keep our vehicle in a safe state, no chances of shorts and any electrical damage there you'll receive a wire included with your kit. That's a heavy enough gauge to allow your battery to trickle charge and enough length of wire, to be able to make the connections here at your battery, to your circuit breaker. And as well as to the front, to your connector there. You also receive some wire loom in the kit to protect your circuit as you're making all of your routing and connections.
So, if you want to follow along with us, we'll show you how to get this installed. This is something that honestly you could probably do in your driveway or in your garage, even in less than a half an hour, it's a really easy thing to get done. And it does really just put you at peace of mind when you're going down the road, knowing that when you get to your spot, you're not going to have to take that motorhome somewhere. You can unhook and enjoy your easier to drive vehicle. We'll begin our installation by mounting our circuit breaker. You'll want to determine a location that's close to your battery. We're actually going to put ours right next to this ground, Start right here. There's a pretty good spot right here to Mount it up. So, for now we know what location we're going to Mount it up. We can go ahead and run it in with our self-tapping screws. What I like to do is to hold all this stuff together though, I'll take the top and the self-tapping screw. I'll put it through the hole. And I'm just kind of scratching a little mark where I want the self-tapping screw to go. This way We can use this right. It's a lot easier than trying to hold all your pieces together when you're turning to get these self-tapping screws in place. So, we're just going to run this in now. And once you get it started, we can then go ahead and back it out of there. So, now that we have our circuit breaker and we'll get it installed, your bronze post is labeled battery. And would normally under most accessory applications, you would hook best this side here to the battery in your vehicle. But since this is a Charge Line Kit, we're going to be using our motorhomes battery. And alternator and charging system to charge this battery. So, the power supply is actually going to be the motorhomes. So, the stud here is actually going to go to the front of our motorhome to send power to this, to then output it to our battery. So the ox is actually gonna hook to the battery and this particular application that we're using it for. So, we're sliding our self-tapper now through one of those, eyelid ends on our circuit breaker, and then we round it down just a little bit easier this way, trying to hold all those pieces together. Now that we've got that one snug, it kind of holds this high over here, snug for us, making it easy to run this one right in. So, here we've got our wiring. This needs to route from our circuit breaker to the front of the vehicle. We're going to route that first and we'll hook it up to our battery. Actually last to prevent us from accidentally causing any shorts. So, we're going to take our red wire here. We're going to strip it back and after we strip it back, we're going to take one of these smaller ring terminals that comes in our kit here and attach it to it. We'll then loosen up the Brown stud one labeled battery. After you remove the nut, slide your wire in place that small ring terminal there, and then just reinstall the nut. We can come back and snug these down here at a later step. We're going to go ahead and get this wire routed out towards the front of the vehicle when routing your wiring, you want to avoid anything excessively hot and any moving components. So, we're going to take ours down here. We'll probably run it underneath and then bring it forward to where our electrical connectors located at the front of our vehicle. And we're going to go ahead and zip tie it along the way to make sure our wire stays secure and in place where we want it. So, it doesn't fall down and wrap up into anything, so we've got our connections made to our connector at the front. We can come back here and go to make our connection at the battery. So, we're going to take the remaining excess wire that we've got here from trimming off the excess up there at the front. We'll strip this back. We'll then take our small ring terminal, fly that in place connected to one end. We then remove the nut from the silver post on our circuit breaker. Slide our new wire on there, and then we can tighten this down. And at this point, it's a pretty good idea to go ahead and snug these up. Just snug them up using a 3/8 socket. We can go ahead and snug these down with that 3/8 socket. You don't want to over tighten them, just make sure they're snug to where they don't slide around or anything. You can't rotate on the, on the stud there. We going to take the rest of this wire. We're going to kind of just wanna shorten it, but we also want to leave length there for the future to be able to make any repairs or, you know, anything we might want done. So, we're going to be trimming down some while leaving a little bit of excess. We'll strip this back and then this one's going to get the larger ring terminal that's in your kit. This guy right here. This will attach to the battery positive post on our vehicle here. So, we get that put together. We can go ahead and put back our battery cover. So, now we'll just take up, strip up the cover for your battery positive. We did turn it to the side and push on both of those tabs there, to let this open up and now we can kind of slide our wire in here to make it look a little bit neater, and then we can close those back up. Will now remove the nut located here with a 10 millimeter socket. Take your ring terminal, slide it right on top. And then just re-install that nut And you will get some wire loom in your kit so we can go and cover our wiring with the loom, especially at any point where we suspect it could have a spot where it could rub through. So, any place where it's kind of turning the corner, where it might be tucking, some metal or anything, that's a good location to make sure you got some wire loom on there. And that completes our installation of Roadmasters Charge Line Kit on our 2012 Ram 1500..
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
- etrailer mistake
- Product did not meet expectations
- Wrong item was ordered
Ratings & Reviews
4.7
1489 reviews
by:
Nico
04/22/2026
Worked as advertised. Keeps towed vehicle battery charged while using Patriot 3 breaking system. Customer service (Dominic) was excellent. Don't get too creative with wire routing. Though the wiring is long enough, there are limitations. I used an aluminum bracket from a rain downspout as a bracket - see picture.
by:
David
11/01/2026
This works well to keep my toad battery charged while driving. Surprisingly though, there is a 2 volt drop across this short run. Still supplying over 12 volts to the battery.
by:
Michael
09/21/2026
Joanne and William B did an excellent job hooking me up ( pun intended) with a tow bar and all all the attachment. Great product knowledge and suggestion got the right tow bar at a great price. Shipping and delivery were on-time and in great condition. I couldn’t be happier e service and merchandise from eTrailer.
by:
Ron E
10/28/2026
Just towed my Wrangler home and had to park the rig slightly nose down and off a bit to the left, with the weight of the Jeep against the catches. I thought, “oh boy…here we go…”. Touched the release handles with one finger each and Ta Da! Released!! Absolutely amazing.
by:
Larry
09/30/2026
For a 15A breaker, a little loom, wire and wire ties, Roadmaster is expensive. Kit worked well but a 15A breaker would be cheaper from auto supply.
by:
Steve
08/05/2026
If you are flat towing a Ford Maverick Hybrid, save yourself some grief and add this item from etrailer to the tow package!
by:
Roy
07/24/2017
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.
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.
by:
Jeffrey
12/22/2021
have successfully completed the installation of the following items that I purchased from etrailer:
> Nighthawk RM-676 tow bar
> RM-524458-5 base plate
> DEMCO Stay in play DM86VR
> RM-152 diode wiring kit
> RM-156-25 charge wire kit
> RM-88400 brake switch relay kit
I work slow but methodically. I had no issues other than the high degree of difficulty for a 68 y/o man working alone. This project exceeds the abilities of someone NOT mechanically inclined. There is also the need for some specialty tools. I found that feeding the wiring through the dash, firewall, and underbody was more difficult than installing the front baseplate. Overall, I am satisfied with the function of this installation. I am glad I did it myself rather than having it done.
Tow vehicle: 2021 Entegra Emblem 36U
Towed vehicle: 2018 Ford Fusion Platinum Energi
> Nighthawk RM-676 tow bar
> RM-524458-5 base plate
> DEMCO Stay in play DM86VR
> RM-152 diode wiring kit
> RM-156-25 charge wire kit
> RM-88400 brake switch relay kit
I work slow but methodically. I had no issues other than the high degree of difficulty for a 68 y/o man working alone. This project exceeds the abilities of someone NOT mechanically inclined. There is also the need for some specialty tools. I found that feeding the wiring through the dash, firewall, and underbody was more difficult than installing the front baseplate. Overall, I am satisfied with the function of this installation. I am glad I did it myself rather than having it done.
Tow vehicle: 2021 Entegra Emblem 36U
Towed vehicle: 2018 Ford Fusion Platinum Energi
Jeffrey
11/19/2022
I have no regrets with this purchase. Items preform as advertised with no issues. I am very satisfied with Roadmaster and Demco products.
by:
Tara
09/05/2026
Products worked perfect for my 2024 Trax. Dixie RV do tors were recommended for installation and they were awesome!
by:
Ian
06/21/2026
This kit should come with a diode included. The kit works, but you get feedback to the plug which causes the rear car lights to stay on. I am sure that a diode will fix this problem.
by:
Charles
06/09/2026
An absolute necessity if towing a vehicle. Easy to install and you won’t have to worry about a dead battery while towing.
by:
Richard
09/24/2026
it is a wire that should be longer and a circuit breaker
by:
Alan
06/30/2026
Works well keeping our towed battery charged!
by:
Pat
07/02/2026
Works great, keeps battery charged while Jeep is towed.
by:
Ken
02/26/2025
Easy to install and Jeep battery is always charged arriving at the campsites.
Ken
2/27/2026
Great little product. Worked great while we needed it flat towing and the brake controller and lights were being activated. Now the Jeep is babied , trailered and enclosed.
Gwendolyn Y.
2/27/2026
@Ken That's next level pampering, love to hear it.
by:
Marty
04/13/2026
I read that this is a must have for the Bronco. Evidently the battery can go dead while towing which could cause the Bronco to come out of Flat Tow damaging the transmission. This is cheap, easy to install insurance.
by:
Jim
06/15/2026
Works as promised and has kept the battery charged
by:
Ron
12/20/2024
I never knew I needed this for flat towing. Sales rep helped me pick the right item. Shipping was in a timely manner and the price was fair.
Victoria H.
1/9/2025
That's awesome Ron! I will let them know you reached out.
Ron
12/20/2025
The Roadmaster accessories work great - the brake switch in the car is ideal for turning it on and off as required.
by:
Mena
12/05/2025
Works great, I was having trouble keeping my car battery charged while flat towing. I have to keep my car key in the acc position and its electronics and the power brake has to get plugged in the car lighter eating away at my battery so when I stop usually around the second stop and restart the car the battery is dead. With this charge line kit my battery stays charged! It’s a win. I hope I explained it properly
by:
Adam
06/14/2026
Solid option for a charging solution while towing. Easy DIY install.
by:
Jason
07/29/2026
Really simple install if you dont drop a screw into the engine compartment…lol. Could use a little extra wire, maybe 12 inches to account for ‘things’
by:
Wayne
03/21/2026
Everything fit and works well. I’m happy with the etrailer instructions I installed everything myself didn’t take long at all
by:
Art A.
11/27/2025
Easy install. Especially when installing in conjunction with the towed vehicle wiring kit. This will keep your battery charged due to battery drain from the turn signal/brake/tail lights on your towed vehicle.
by:
Blake
10/24/2026
See the other product review
by:
Richard
11/09/2026
Easy install
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view full answer... - Best Flat Tow Setup For 2026 Ford Maverick XLT HybridHello Dan, thanks for reaching out. We can definitely provide the full flat tow system for your 2026 Ford Maverick XLT Hybrid. Here is what I recommend: - Demco Tabless Base Plate Kit - Removable Arms # DM38CV - etrailer XHD Non-Binding Tow Bar - RV Mount - 2" Hitch - 10,500 lbs # e94ZR - Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Coiled Adapter Cord # RM-15267 - Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 - Demco Stay-IN-Play...
view full answer... - Best Flat Towing Setup for a 2025 Ford Maverick HybridHey Shawn! You can definitely mix and match manufacturer's when setting up a flat tow. The one major thing you really have to pay attention to is the compatibility of the tow bars with the baseplates. You can mix up brands but they have to have the correct ends to connect to the baseplate if you do. Since you have a brand new 2025 Maverick, I highly recommend a permanently installed braking system. The one time in-depth installation is far easier than repeatedly having to setup and break...
view full answer... - Does the Curt Base Plate Kit Work w/ the Ford Modular Bumper on a 2025 Ford Bronco Everglade?Yes, it does John. So long as you have the Ford Performance Heavy Duty Modular Front Bumper with the tow hooks, the easiest way to flat tow it is to use the Curt Custom Base Plate Kit item # C59JR. This adapter connects right to the tow hooks without any modification to your Bronco. Please note that the Curt Custom Base Plate Kit item # C59JR, will only work with the Curt Rambler Non-Binding Tow Bar item # C25DQ. There is no adapter or way to use this baseplate with another manufacturer,...
view full answer... - Parts Needed to Flat Tow 2005-2007 Jeep Liberty Behind RVIn order to flat tow your Jeep Liberty behind an RV/motorhome, you need a base plate kit, a tow bar, safety cables, a lighting solution, a supplemental braking system, and likely a high-low adapter. Starting with the base plate kit, I recommend the Roadmaster EZ5 Base Plate Kit # RM-521423-5. These base plates are custom fit for your Jeep and feature a hidden bracket design for a clean look when you aren't towing. Its black powder coat finish is durable and will work do a nice job of...
view full answer... - Full Flat Tow Setup For 2023 Ford F-150 and 2026 Jayco Greyhawk Hey Dan, Congrats on the brand new motorhome! For your 2023 Ford F-150, I’d start with the etrailer Invisible Base Plate Kit, part # e86YR. This is a really nice option because it keeps the front of your truck looking clean when you’re not towing. The arms come off easily, so you’re not left with anything bulky sticking out all the time. To hook up to your Greyhawk, the etrailer SD Non-Binding Tow Bar, part # e34ZR, is a great match. The non-binding feature makes a big difference when...
view full answer... - Parts Needed to Charge Battery of Towed Vehicle while Flat TowingI 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...
view full answer... - Can I Run the Blue Ox Patriot Braking System On It's Own 6 Volt or 12 Volt Battery?Hello Chris, You can run the Patriot off an auxiliary 12V battery, but it’s not something I’d recommend as a long-term solution. The unit is designed to pull from the Jeep battery, and the draw is actually pretty low. If your battery is going dead while towing, it’s usually other systems in the vehicle pulling power, not just the Patriot itself. With a separate battery, the biggest concern is reliability. If that battery runs down, you lose power to the braking system. You’d also need...
view full answer... - Flat Tow Set Up For a 2026 Jeep WranglerHey, Skip! Happy to help get your new Jeep set up for flat towing. There is going to be a list of parts, so I'll go ahead and list them all below for ya. Blue Ox Base Plate: Part # BX1139 Blue Ox Avail Non-Binding Tow Bar: Part # BX7420 Demco Stay-IN-Play Duo Braking System: Part # DM86VR Roadmaster Stop Light Switch Kit: Part # RM-751490 Roadmaster Battery Charge Line Kit for Towed Vehicles: Part # RM-156-25 (to keep your battery charged while flat towing) Roadmaster 4-Diode Universal...
view full answer... - What Supplemental Braking System Should be Used with Two Different Tow Vehicles with Diff BrakesHey Larry, you are on the right track picking out the correct components to flat tow your 2022 Jeep Gladiator but since your motorhome has air brakes that vehicle will need to have the Air Force One part # SM99243 installed on it which will not work with your truck that has hydraulic brakes. So this is a frustrating situation so what I would recommend is a removable braking system like the Blue Ox Patriot part # BLU37TR. There isn't a permanent install option that will work on both tow...
view full answer... - Differences Between the Demco & Roadmaster Base Plate Kit for a 2024 Ford MaverickThe main difference between the Demco Tabless Base Plate Kit # DM77YV and the Roadmaster Direct-Connect Base Plate Kit # RM97RR is just going to be the brand really. They're both very similar in the way they install, with Roadmaster being a bit more challenging requiring some trimming on certain models, they both have a removable drawbar, and they both use a direct connect style attachment. If it were me I'd go Roadmaster just for the fact that they've been consistently a household...
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Roy
7/30/2018
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,