What Cables and Connection Plug do I Need to Charge My Trailer from My 2005 RAM 2500?

Updated 03/01/2022 | Published 02/27/2022

Question:

Hello I own a 2005 RAM 2500 truck and tow a 25 Airstream, and want to improve the ability of the trailer batteries 2x100ah to charge from the alternator. The 14ga charge wiring to the 7 way and lack of isolator means I get almost no charge now. Id like to install an isolator, run a heavy gauge wire pair to the rear bumper of the truck, and install an aux charge plug and cable to the trailer. I need a recommendation for the aux bumper plug and mating trailer cable. Can you recommend? Also, are there isolators that incorporate multi stage charging like battery chargers do? Or do I need a separate device in the trailer to do that? Thanks Andy

asked by: Andrew S

Expert Reply:

For the correct bumper plug and cable, the correct part you need for your application is the Bulldog Winch Booster Cable Set w/ Power Leads - Quick Connect to Clamp - 2 Gauge # BDW20197. This part is sold as a winch cable, but it will work for your application.

As far as isolators that incorporate multi-stage charging, we unfortunately do not have a part that gives you this function from your alternator.

expert reply by: Bob C