Everything now clean and tight ran the truck for a few minutes and the voltage seemed to hold steady at just over twelve, not as much as it was putting out on a regular basis before(14-15) it was clean. With the heater fan running plus the lights on it drops to 11.25 -11.5 is that about right? Have concerns about not enough power now when i turn on amp and sound system. The truck is stock except for the engine rebuild is it maybe just time to address the 50 year old wiring.