Amp guage maxed out.

Richie said
Vin. LH23D9B16710
Dart Custom
2 DR HT
273
1969
Hamtramck MI.
Last six digits are the production numbers

When I got the car eighteen years ago it had a 318 in it with electronic ignition witch worked fine. Found a 340 for it ten years ago and finally had it done bought all new electronic ignition. Wiring harness shorted out at the shop and was.......fixed. I was talking to a wiring guy on the phone today where I could explain things much better I'm not a very good reader answerer ...much better on the phone and from what we discussed the best thing I can come up with is take the car in and get a new painless wiring kit put in because of what happened and also because of how old the original is.

You will chase your tail forever and dump a bunch of $money on this problem.
If the ammeter is pegged and the battery is charged you have a short in the harness.
If this was my car I would gut the charging system and convert it to a one wire alternator that has an internal voltage regular and get rid of the harness that Billy Bob "fixed" because it obviously is not right. They make aftermarket harness's that will convert your system to a one wire charge system.
I recently put a Powermaster one wire on my Barracuda charges nicely.