1970 Chrysler 300 - No Power

Was the wiring replaced as a result of what is happening; or was the wiring replaced, and now this is happening?
It happened before while I was driving. I would pull over, try to start the car and no luck. I would get towed home then start the car and drive it into the garage. Until yesterday, after replacing the wiring harness, it has only been happening when I went to start the car. Yesterday it was as I was driving. I have no idea where a relay would be, unless it is in my charging gage. It seems like ALL of the power goes through the charging gage then out from there. I have thought about putting in a wire to bypass the charging gage but not sure if that would create a problem.