A while back I converted my 34 coupe to 12 volt negative ground. Had generator rebuilt with 12 volt field coils and had to buy a new 12 v voltage regulator. It would not keep the battery charged and the amp gauge always showed a discharge. I checked the generator by connecting the field and armature together and it would charge great. So I got another voltage regulator. Same story! Took it back to the generator shop and they "adjusted the regulator" . Now after a few days of discharge it would peg the amp gauge + . Thinking that the amp gauge was off I added a voltmeter. Same story, it would go for days discharging only to start overcharging at will. Then it quit charging at all and the battery died. I charged the battery and checked again but even though the generator had the capacity to charge, the voltage regulator didn't work. So I did a search here for generator/ regulator issues and someone said that if you are using the new blue voltage regulators that all the parts houses sell, you are wasting your time, they are all junk. They recommended trying to find an original ford voltage regulator, so yesterday I spent time under the hoods of old 12 volt ford cars in the junkyard until I found a decent looking regulator. I bought it for twenty bucks , took it home and cleaned the points and installed it. Works great! Thanks to all for the help!