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Maintains the battery charge on your towed car while it is being flat towed. Works with Demco supplemental braking systems. Includes diode and fuse.
Features:
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody, Andy here with etrailer. Let's take a quick look at this towed vehicle battery charge line kit for your Demco Air Force One and Stay-IN-Play DUO braking system. Now, if you're flat towing a vehicle behind your RV, one of the biggest concerns is making sure that your towed vehicle's battery doesn't drain while you're going down the road. That's exactly what this battery charge wire kit is designed to prevent. Now, this features a built-in LED indicator. So, instead of wondering whether your charging system is actually working, the LED is going to light up whenever a complete electrical circuit is established between the motorhome and the towed vehicle.
So, it's gonna give you an instant visual confirmation that the battery is receiving a charge while you're towing. That simple feature is going to take away a lot of guesswork. Without it, you might not realize there's a connection issue until your towed vehicle's battery is dead at your destination. So, with that LED, you're going to be able to quickly verify everything is connected and functioning before you hit the road. This also includes diode protection, which is going to prevent electrical current from flowing backwards into your vehicle's electrical system.
And then the integrated fuse protection to help protect the wiring and electrical components from damage. And this includes a 10-amp fuse, as you can hopefully see there. So, those built-in safeguards are gonna make this a more complete solution than just a basic charge wire installation. Overall, this battery charge wire kit is going to provide a direct charging connection from your RV to your tow vehicle's battery while you're traveling. So, its job is going to be to keep your battery charge in your vehicle.
Again, that's gonna help reduce the risk of battery drain with the added LED indicator, which is a great feature. And it's gonna be a whole lot easier for you to confirm that your charging system is working as intended while you're traveling. If you would like some help with getting this installed on this product page, underneath the Photos section, we have a link that will take you to our Installer Locator. Click that link, answer the questions that it has for you, and that locator will find an installer in your area that etrailer has partnered with to get this installed for you. Well, again, my name's Andy.
Thank you for joining me.
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
Ratings & Reviews
Everything I need to charge my toad. Easy install
Absolutely perfect. Easy installed.
Everything as described and easy to ins tall
Easy installation and simple product
This was the final pice I needed for the competition of the demco tow system. E trailer has been a great resource both with their online stores and their online YouTube help on install couldn’t have done it without them.
Quality product easy to install I would recommend it
It works as expected, keeps battery cha rged
Install was simple and straightforward. I like that you don’t have to cut and crimp ends. I think there could be a lil more wire to give you more routing options. Overall would highly recommend. Fast shipping. Everything needed was in the kit.
Easy to install. Great consultation when I called. Love these folks.
David W.
2/8/2026
Just fine! Been out west and down east. Absolutely no worries about disconnecting and being able to start the jeep.
Kate F.
2/9/2026
Easy to install. Video was perfect.
Most simple and easiest to install charge line kit
Easy to install, works great on my 2023 Jeep Gladiator!
Appears to be good quality but upon installation found that the wire was too short to route it safely. Added about 3 feet of wire and all is good
Never used one before, but now I feel these are well worth the money!
All good and easy installation!
Very good web page, easy to navigate. Shipping is a little slow, but over all a
good source for supplies. Great job.
all worked great Love the videos they help a ton cold not have done this job with out them
Lazer S.
6/16/2026
Glad we could help, Scott! What vehicle are you flat towing? And where all have you taken it?
Installing on 2020 Jeep Trailhawk :
Pic #0557 : Roadmaster Base Plate Kit , Demco Supplemental Braking System , Diode Wiring Kit , Demco Battery Charge Wire Kit
Pic # 0548 ,0551 , 0559 Had to adjust the bracket plate to line up with the upper bolt holes
Pic #6028 finished install , mounted the operating unit to the top fuse box cover using automotive Velcro . Air cylinder , controller and LED light installed . Aside from the base plate bracket not lining up with the upper bolt holes I would give it 4 stars . My son in law is a master at solving mechanical issues .
Easy install on Jeep gladiator, 1 hour, but I'm very picky on installation. No more dead battery on arrival after 8 hour run. Tow with diesel pusher.
2nd one I’ve bought for another Jeep. I like the idea of the light coming on and knowing it’s connected right!
My five-star is for E-Trailer, not Demco. What I think is, why didn't my Brand new installation of the DEMCO Stay-In-Play Duo not include this item. I had a dead battery on my toad after my first tow. DEMCO, please include this as part of the braking system package installation. It caused me money and the stress of a car that would not start. Anyone getting the Demco Braking system, make sure you have the correct charge part for your car.
Keeps the battery charged 100% with the use of my brake buddy for my tow car.
James
3/22/2026
After a year using solved my problem with my battery going dead using a breaking system. Worth every penny!
Great service, thought the Demco cover was a little pricey but overall was good.
I viewed a couple of installation videos for similar products.
The key point is that the power wire connects to the center screw of the connection plug.
I used lots of tape to protect from scraping. I McGivered some zip ties to hold the controller box in place. Then prayed and tested. The green light on the controller came on!
Checked the other lights and all were still working. The whole process took about two hours. This was the first time I had connected one of these.
Good quality harness. I added a .50 led light prior to the diode so I would have a visual indicator to make sure power is available when RV is plugged in and running.
Mike L.
4/23/2026
That's a cool idea Brian, I like that!!!
Do you have a question about this Accessories and Part?
Info for this part was:
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Carlos
12/25/2025
After a year the product continues to perform without issues. Have not experienced any charging issues while towing.