This is a bit of a frankenstein car since almost everything was stripped when I got it and most of the parts have been picked up along the way. I just very recently got it running (has yet to leave the house) and I noticed that the charging system is undercharging at idle and over charging when the engine is rev-ed up. The voltage pretty much follows the rpm. The regulator is new, so is it bad? Should there be an engine to body ground or engine to the firewall ground somewhere? Also, someone cut all the wires to the top of the bulkead connector for the wipers etc. Does anyone know where I can get new terminals to replace them? Thanks in advance!  

i just had a problem with my 69.and even though it was a newer volt reg. it was bad also as ar as the grounds they say you can never have to many of them. one from the battery to the motor, one from the battery to the body  one from the motor to the body and the motor to the frame, i followed all these steps and mine is working great now. also painless wiring on summitracing.com
Painless Wiring 10127  that isthe part number for a compete harness is spendy at 454 an dsome change but says its all of it also a place here in portland oregon called wildcat auto wrecking has tons of projects cars and parts for sale the also ship all over the country i think they have everything mopar there number is 503 668 7786 hope this helps also i have a pdf of the harness of a 69 if that would help just email me at myfyn69@yahoo.com and i would be happy to share what i have. hope this helps........  

You should absolutely ground the motor the frame and it can't hurt to ground the body.  Some devices need grounds to balance or stabilize their voltages.  You might want to put in a grounding block, it'll probably look better.