my son has a 69 coronet we have been working on, we put a up graded electronic ign. system on it and voltage regulator and it was fine for awhile now it is over charging . we changed the alt. and v r a few time and still the same thing . done a lot of searching on this with no luck. I have check all the wires for shorts and the harness under the hood is new. tried other sites no luck with them thought you guys could maybe help.