How Can Truck Charge Battery of RV
Updated 06/22/2026 | Published 06/12/2026
Products Featured in This Question
Question:
How do you get 12v to plug to charge rv battery on a 2017 ram 3500
asked by: David C
Expert Reply:
Hey David, I did some checking and the 12 volt accessory circuit of your 2017 Ram 3500 is active all the time so you can use it to charge your trailer battery. The 1:00 pin of the 7-way carries this circuit and it would need to be ran on the trailer side 7-way to the positive pin of the battery using 10 gauge wire like the part # 10-1-1. This is great for like a light maintenance charge for the battery.
Now if your trailer battery is lithium you would instead need to use a BCDC charger like the Redarc part # RED36TR since lithium batteries are a lot more particular about how they charge.
Product Page this Question was Asked From
Redarc Tow-Pro Link Bluetooth Brake Controller - Off-Road Mode - 4 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Electric over Hydraulic
- Plug-In
- Smartphone App
- Behind-Dash
- Up to 4 Axles
- Smartphone Display
- Multiple Trailers
- Redarc
more information >
Featured Help Information
Instructions
Continue Researching
- Q&A: Recommended Flat Tow Braking System
- Q&A: Will Redarc Tow-Pro Link Work On 2021 Silverado 1500 With Factory Brake Controller
- Shop: Redarc Tow-Pro Link Bluetooth Brake Controller - Off-Road Mode - 4 Axles - Proportional
- Shop: Brake Controller
- Q&A: Can Redarc In-Vehicle BCDC Trailer Battery Charger be Connected at Same Time As Trickle Charger
- Shop: Redarc In-Vehicle BCDC Trailer Battery Charger - Dual Input - DC to DC - 12V - 12 Amp / Solar 40 Amp
- Shop: Curt Trailer Breakaway Kit with Trickle Charger, LED Tester, and 5 Ah Lead Acid Battery - Side Load
- Search Results: electrical connector
- Search Results: battery charger
- Video: Review of the Redarc In-Vehicle BCDC Trailer Battery Charger
- Shop: KAT5 Multi-Connection Battery Terminal - Standard - 5-Gang
- Shop: Loctite Bulb, Lamp, and Electrical Connection Dielectric Grease - 0.33-Oz Tube
- Shop: Jacketed ABS Trailer Cable Per Foot
- Shop: Bright Way Trailer Breakaway Kit with Charger, LED Tester, and 5 Ah Battery - Side Load
- Video: Curt Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger Spec Review
- Article: Trailer Wiring Diagrams
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Search Results: trailer hitch
- Shop: Trailer Hitch
- Shop: Trailer Wiring
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Search Results: trailer wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Recommended Bike Rack and Dual Hitch Adapter for Carrying E-Bikes While Flat Towing
- Search Results: trailer tires and wheels
- Shop: Suspension Enhancement
- Video: Redarc Tow-Pro Liberty Brake Controller Review RED24FR
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Parts Needed to Install a Red Arc Brake Controller in a 2023 Toyota Tacoma
- Search Results: brake controller
on Trailer Brake Controller
David C.
6/21/2026
When I hook up the controller my plugs don’t have 12v is there a certain way to hook the controller up I have two plugs one on bumper other in bed