I need some help with an old Dodge truck.

Cope said

The truck needs a full rewire so why not?

With a 12V system the owner can buy parts easy and off the shelf.

The biggest reason is the engine cranks so slow on 6V.

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If the truck needs rewired, the go to 12V

FYI if you encounter a 6v system with good wiring, NAPA sells 8V batteries that helps the cranking of older cars, and will not cause any damage to 6V stuff.