Charging While Towing
Newbie to the forum here. Looked around a bit and didn't see anything specific so worth a fresh post. We just took our first long trip in my 16ft TT after I installed a new (4)6-volt 460AH system ...
Forum Discussion
Rustofer wrote:
Another thing that could be happening is that your alternator is pushing out current based on the needs of your starting battery, which gets replenished quickly. It's frustrating that today's trucks come with high-capacity alternators that basically do almost nothing because the sophisticated controls tell it the starting battery is fully charged. I've wondered if a way around this would be to wire the trailer connection directly to the starting battery with an isolator that opens when the truck is not running. Hmmm . . .
That’s not really how an electrical system works. The trailer charge line will draw current from the vehicle electrical system and that draw will cause the voltage to drop and the charging system will increase output. The trailer batteries are in parallel with the starting battery, so they are all one electrical system.
