rfischba1

I tried to start the duce today and had to uce the m1008 to jump the truck, I let it run for about 40 min. and about 2 hours later would not crank.
Tested batteries , one had a full charge, the other dead.
I charged the dead battery for about 2 hours and it now has a full charge and the duce starts.
Question: the bad battery is 3yrs old Intersate LT6, will it hold a charge if I run the truck?
Will both batteries charge at the same time? Or does it take both batteries to start the Duce.
Is it time to replace the one that went dead. The other intersate is only 2yrs old.