I have an 83 gt and i have been having this problem since 2007. i was in SC at mustang week myrtle beach and my car had no issues. i parked it at a hotel and came back a few hours later and was dead. jump started it and i only have hi beams all four head lights on i just unplugged inside two so i can drive at night. switch to low beam no lows at all. after that. My gauges all spike about a quarter of the way up and my car will start to bog and stereo goes static and will cut in and out. I turn everything off and drive through it and my gauges will return to normal eventually. Ive changed about ten voltage regulators, 3 dimmer switches, 3 multi function switch, 3 alternators, 3 new batteries and swapped out of my 5.0 explorer that i dont have issues with just to make sure. 2 starters. Im fed up with this issue swapping charging system parts with no fixes. I'm color blind so i don't mess with wiring my self. Some days it will be fine others gauges will spike and just about leave me stranded. car doesnt like to start so good warm even with a brand new starter. i have wrapped my headers and my starter to protect from heat. Ive always ran an 8352pn pro billet dizzy back then still do. added a 6al box in 2011. Car runs like a raped ape when my gauges are normal. Weather has no bearing on this issue, ive figured out after driving it so long .temp gauge always between the o and r in norm. when it spikes just about in the red. fuel goes up a quarter tank. amp gauge doesn't move stays right in the middle. oil pressure also goes up the same rate as the three gauges total. Im lost with this issue. any help is greatly appreciated. My brother is a Chrysler certified master tech that i get free labor out of. he cant plug it in so he wants nothing to do with it.