What method do you use to use the later altenator in the earlier cars? I have been told to remove one of the plastic washers on one of the field terminals with a metal one and ground it to the case, is this correct?

A short jumper wire from the 2nd field terminal to one of the (3) thin case bolts will work or pirate a grounded brush holder from an earlier alt or as you said eyeball it & change what you have to to make the brush holder grounded

Upgrade the wiring harness and use it to it's full potential with the 70up volt reg.

myself,I would go with the single wire alt that came on it,then upgrade the points style VR with a soild state replacement they have for them

made a world of diff with the 68 Dart,fixed the discharge at idle with the light on,and the amp gauge stop jumping around and was steady across the gauge sweep after that

uping the amps is not a good thing on the older sytem like that,imo

unless you bypass the amp gauge and up the wire to carry the extra juice you will have with a newer alt

and I've got 2 ( single groove and double groove )75 ampers for sale at a real good price under for sale, engines, small blocks. E-mail me if you want pics.

I assume you want to put a dual field alt on your GTX's single field alt ?? Do you want to update to the newer style electronic regulator ?? It is so simple to do but we need to know if you want to stay with the old mechical type regulator or the newer (70's & later) electronic regulator ? Ron