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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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- Reviews (1489)
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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 2020 Chevrolet Traverse Roadmaster Battery Charge Line Kit for Towed Vehicles: Complete Installation
Hey everyone, Ryan here at Etrailer. If you don't want to have to deal with a dead battery whenever you get to your campsite after you're done flat towing, then that's what this kit is going to help prevent. This is made by Roadmaster, and it is a towed vehicle battery charge line kit, and we're gonna check it out, talk about why it's a good idea to use something like this. And we're gonna show you how we set it up today on our 2020 Chevy Traverse. What this kit is gonna do is really simple. More or less it's just going to trickle charge or maintain your Chevy's battery whenever you're pulling it behind your motor home.
Because what can happen, you're over the road for hours on end and your supplemental braking system that applies the brakes in your vehicle uses the battery power to turn on and actually apply that brake pedal. So you hit the brakes, you hit the brakes, you hit the brakes, it keeps stealing a little bit of juice over time. And a lot of these more late model cars now too, they have a lot of different types of accessories that use battery power even when the vehicle's off. You'll see electric-assisted steering, electric-assisted brakes, so on so forth. And so what can happen without something like this, you get to where you're going, the battery's dead, and then you gotta deal with trying to jump it or charge it, bother someone to help you out, whatever the case may be.
And so with this hooked up, it's going to use power from your motor home's seven-way connector, the auxiliary power which is on the coach to begin with for an accessory like this. It'll send that extra amperage back through here into the battery, keeping it charged up. Now as far as a lot of people ask, "Well, is this gonna affect my motor home or anything like that" And the answer is no. Like I said, that's what that auxiliary power is there for, to use something like this. And the motor home has its own charging system, right The alternator.
So when that's running down the road, it's charging its own batteries and definitely has a little bit of extra spare to send back here. The kit is going to use a circuit breaker to help keep everything protected. So the power from the motor home will run up into the breaker, through it, and coming out of it will go over to your positive battery terminal. So if a short or something like that we inchesre to occur, the breaker would trip and not damage anything associated with it. Now to compare this kit to some of the other ones available, they're all gonna work.
It doesn't matter what braking system you have or nothing, they're all gonna get the job done. I happen to have one made by Demco here on hand. This is a great kit too. I've done a ton of these, ton of these Roadmaster ones, quite a few of the Brake Buddy ones. And if you we inchesre to ask me if I have a preference, not really, I like the Demco one because it uses a regular fuse as opposed to a breaker. So if an issue we inchesre to happen, the fuse would pop, and you could get it figured out and put a new fuse in it. It also, the Demco one uses a diode too to help prevent back-feeding from this battery down to your connector plug in the front of your vehicle. So that could potentially help with corrosion issues and stuff on the connector plug. But like I said, been doing this for a long time with these Roadmaster ones. Haven't ran into an issue with them yet. So it's a simple component, and a lot of times it's overlooked. It's just one of those things people don't really think about until they deal with a dead battery or things like that. So pretty cheap insurance. It's something I recommend on every flat tow I set up, whether you have to have one on here or not, it's just a good idea to tease something like this. So really can't go wrong there. As far as the installation goes, really simple. It's one wire, right Your battery, mount up your breaker, run this down to the front. That's really all there is to it. So take your time. You should be in pretty good shape. If this is something you're not comfortable doing, I completely get it. You can always use our dealer locator network to hopefully help you find a shop that'll do it for you. But if you're gonna set this up yourself, feel free to hang around. We'll go ahead and get started on it now. I like to get our charge line hooked up first and the back of the connector plug, this post here in the center, that's the one that we're gonna be using. You can take a small screwdriver, back that set screw out almost all the way. We'll take the wire, put that into the terminal, and tighten it down. So I got our charge line placed in there. If you're setting a charge line up, ideally you wanna do that one first because it's easier. So a charge line will go in the middle. But with that said, the way these work here is these set screws, you wanna take a screwdriver and back them out almost all the way. And there's gonna be four of them that we're gonna be hooking up. And they are labeled, they're kind of tricky to see, but we have TM for taillight. So the brown wire goes there. GD for ground, so the white wire goes there. Let's see, this one is LT for left turn. So the yellow wire plugs into that. And then this one is RT for right turn. So the green wire goes there. Once all your connections are made here at the back of the plug, take the boot, cover it up. And usually what I'll do at the very end, once I verify everything is working, I'll come back in here with some silicone and coat it real good to help prevent corrosion. But I wanna wait until I know it works because if you have to get back in here for whatever reason, you don't wanna have a huge mess to deal with. So let's put this on for the time being and mount up the connector plug here. Now we can mount up our circuit breaker, and you wanna put this as close as you can to the battery. This spot here is pretty good, out of the way, and you just secure it with the self-tapping screws that they give you. So I got one started. We'll run this other one in here, and then we'll go ahead and just get these nuts removed off of the post there. We'll take our wire now and get it lined up with the gold post on the circuit breaker. The gold post is labeled battery, so you might be tempted to hook this wire up from here to the battery. But in this case, our motor home is acting like the battery, being that this is a charge line. So that's my reasoning there. But we're gonna cut that, strip it back. We'll take one of these small ring terminals, place it over the bare end, get it crimped down. We'll slide that right over the post, and put that nut on and snug it down at 3/8. And you don't have to crank on these by any means, just get it in snug. And for this post here, we're gonna take the remaining portion of the wiring, we'll strip both ends back. And one of them, we'll put on a larger ring terminal. And then smaller ring terminal on the other end. Set this up on our breaker here. Small end will go over the silver post. And I'll get this tightened down. The big end of the ring terminal, that's gonna get hooked up to the positive battery post. And so I'm gonna remove this knot with a 10 millimeter. Put the terminal over it. We'll just get it started again, and tighten it back down. The kit does come with some wire loom, so once you are all wrapped up and everything, you can put that over the wires to kind of clean up the install look and keep it protected. And with that done, that'll finish up our look at and our installation of the Roadmaster towed vehicle battery charge line kit on our 2020 Chevrolet Traverse.
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... - 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,