My '66 4400 Ford is giving me fits with the generator regulator system. I had the gen rebuilt because I knew the bearings were bad and that it wasn't charging anymore. I reinstalled it and found to still have some charging issues. I polarized it when I installed it. It seems to be charging just a little bit. It will make the warning light dim some when running. So I figured the regulator was bad. Got a regulator from a fiend and that didn't help. Figured the one from my friend could be bad. Ordered a new regulator and that one doesn't charge even a little bit. Started doing some testing and checked the continuity and ends on all wires. Everything was good. Started it up and touched 12 volt to the field wire. Instantly the Gen starts to charge. Hook up the field wire to the regulator and still nothing. Any ideas? Can anything be done to test the regulator? Also if I get too fed up will a 1 wire Delco fit on this tractor?