sfritts
TDR MEMBER
This is Just my version, but I would keep the truck engine heater plugged in as much as possible. This will take alot of the stress off the bateries if you live in a cold er area so the manifold preheaters don't have to run. have someone that has a battery tester test your batteries they might not be as bad as you think and make sure they are filled to the correct water level this will kill a battery as fast as anything