I need some help with an old Dodge truck.

Cope said

My thought was with the new coil and not using any of the truck wiring I need not use positive ground regardless of how the truck is wired?

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Does not really matter. You can reverse coil leads but again, if 12V I would DIS connect the BAT connection at generator (if present) or NOT hook it to "system." In other words hook up only the coil and starter You don't want to burn up gauges, etc