have you looked at the big 140amp fuse under the hood in the fuse box that controls your charging its a dealer only item it should have 2 screws holding it down its a burgandy fuse with a clear top i think its $5-$15 at the dealer hope this helps
I just removed stock tach sensor pickup and installed a Recall tach. Not using factory tach. Is there anyway to bypass this. Also installed Fluiddampner.
You can wire in an external voltage reg from any 1970 mopar. I have done it on a few conversions works good. Google 70's mopar reg and you will find a diagram to wire, really simple to do.