How To Fix Trailer Battery Draining Vehicle Battery

Updated 03/07/2022 | Published 03/03/2022

Question:

Trailer is pulling to much power for my van. Would getting a bigger battery fix the issue?

asked by: Zach

Expert Reply:

It sounds like you have an issue with the trailer battery draining the vehicle battery and in which case you would just need a smart device that better manages what power you have. For example, you should only be charging the trailer battery while you are getting a charge from the alternator to the vehicle battery. In order to ensure this happens you can use the Redarc Smart Start Battery Isolator with Wiring Kit part # 331-SBI12KIT which will also shut power off to the trailer battery when the vehicle battery gets low.

I don't recommend a bigger battery for the vehicle as you will still be limited by the alternator, you just need to make better use of the power you have or reevaluate your needs.

expert reply by: Conner L