Hi all. I am new here. Just stumbled on this site by accident. Looks very interesting. Was wondering if anyone can tell me the proper cold crank size of a battery for a 90 Ford Ranger V6 A shop sold me an interstate 540 c.c. battery. Truck seems to be struggling to start always. Sometimes have to turn off all lights and heater to get it to start. The shop said that is the proper cc battery for that model. They checked the trucks electrical system and all is ok. Was thinking unless it is a bad battery is it too small?