[Andy4639]

Originally Posted by 67_C-30

I wired the rear battery in series with the battery in front in Brutus and used a 105 amp alternator from a mid 80's IROC and never had a problem. I just it them charge both batteries all the time. I never had a problem with that setup for 10+ years hauling 100's of cars (lots of them with no wheels and tires) in that time. I did use 2 800 CCA batteries. My truck has rear side boxes, so I mounted one in the box right under the winch.

I always pulled cars up on the truck with the engine running.

Thanks this is the kind of info I was looking for.

If I connect a cable between the truck battery and both 6 volt deep batteries with the contactor I pictured I can charge them whenever I need to. I shouldn't need a wire ran from the alternator to the extra batteries they should charge through the truck battery. I can turn the charging off also by flipping the dash mounted switch.