Recommended Charger And Wiring To Charge Trailer Battery With Towing Vehicle Battery
Updated 06/21/2017 | Published 06/20/2017
Question:
I plan to tow a 13foot Scamp with a 2007 GMC Duramax 2500 HD and have a question regarding how to isolate my truck batteries from the trailer battery. I also want my truck alternator to efficiently charge the trailer battery when the truck is running. Ive read Adam Rs suggestion to use an isolation solenoid TR118665 from TowReady and understand his advice about wiring. In my truck, one of the pins on the trailer connector is always liveinch so I could install the isolator on that hotinch line to project my truck batteries from discharging. I assume that hotinch line charges my trailer battery when the truck is running but Im concerned that it would only provide a trickle charge since the wire size is small. I plan to use my trailer in remote areas without access to shore power and therefore would rely on my truck alternator to charge my trailer battery. For that type of use, should I run a separate heavy gauge wire e.g., 6 AWG from my truck battery through an isloator to the trailer battery via a plug that is separate from my 7 pin connector? If so, can you recommend the size of wire I should buy to run about 25foot and a plug that could handle that wire size? Finally, if I run a separate wire to charge the trailer battery through an isolator, I assume that Id also need to connect the hotinch line on my 7 pin connector to the isolator as well. Would that work, or do I need another isolator for each wire that is always liveinch going to the trailer? Thanks,
asked by: Richard
Expert Reply:
There is a way to charge the battery on your trailer with your vehicle. This is done by using the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1225D. This can be attached to the alternator on your vehicle and if you have the proper gauge wire, will provide a charge for the trailer battery.
I also recommend using 2 AWG wire, which will be sufficient for charging the battery over a long distance. This wiring kit has 25 ft of wiring capable of handling the power you need to charge the trailer battery.
I have attached a drawing that shows how the wiring is done using this charger.
Product Page this Question was Asked From
Redarc In-Vehicle BCDC Battery Charger - Dual Input - DC to DC - 12V/24V - 25 Amp
- Battery Charger
- Battery Charger
- RV/Camper
- Trailer
- 12V
- Charges and Maintains
- AGM
- Calcium
- Gel
- Lead Acid
- Lithium
- Solar Panels to Auxiliary Battery
- Vehicle Battery to Auxiliary Battery
- Smart Charge
- Trickle Charge
- Redarc
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Search Results: x track
- Search Results: e track
- Search Results: trailer cargo organizers
- Shop: Z-TRAK Secure Anything Pro Bundle w/ Ratchet Straps, Anchors, Clip Rings, Bungee Strap
- Shop: ObeCo Metal Storage Shelf - Magnetic - Black
- Shop: Caliber Trailblazer ORV Tie Down Kit - 3,300 lbs - 4 Anchors
- Shop: Tuson Trailer Sway Control System - Electronic - Up to 4 Axles
- Video: Tuson Asymmetric Sway Control Manufacturer Breakdown
- Shop: Snap-Loc Horizontal and Vertical E Track - Galvanized Steel - 1,467 lbs - 48" Long
- Shop: CargoSmart Extended Dual Arm Tool Hook for E Track or X Track System - Steel - 200 lbs
- Shop: Premium Slim LED Strip Light - Weatherproof - 1,500 Lumens - 25" Long - Expandable
- Search Results: rm~156~25
- Search Results: trailer charger
- Search Results: trailer wiring
- Video: Review of Demco Towed Vehicle Charge Line Air Force One Stay IN Play Duo Braking System - DM66VR
- Video: CURT RVibrake Towed Battery Charger+ Comprehensive Review
- Q&A: No Power to Trailer Connector on a 2014 Ford F-150
- Q&A: How To Run a Trailer Battery Charge Line on a 2018 Ford F-150
- Q&A: Recommended Trailer Hitch, Gooseneck Hitch, and Sway Control for 2007 Ram 3500 Flatbed Chassis
- Video: Installation: Roadmaster Battery Charge Line Kit for Motorhomes on a 2022 Jeep Wrangler Unlimited
- Video: Complete Breakdown of the Roadmaster Battery Charge Line Kit for Towed Vehicles
- Search Results: trailer hitch
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Video: Firestone Ride-Rite Air Bags with Easy Mount Compressor Feature Breakdown
- Shop: Trailer Hitch
- Article: Trailer Wiring Diagrams
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Shop: Trailer Wiring
- Article: How to Measure for Trailer Hitch Drop
on Battery Charger
