C charging problems

For one thing, some of the old 3 brush Delco gennys that used cutout relays n light switch field current control only put out something like 10 amps max on their best days. One thing I believe would help, although Ive never tried it on those, would be to go inside the genny n completely remove the 3rd adjustable brush and rewire the first lead field winding (one that 3rd brush was wired to) up there to the incoming ARM post just like the 2 brush gennys are wired. That should eliminate at least a part of the normal voltage drop which moving the 3rd adjustable brush was all about..... ..

Other then that, and AFTER you insure a tight belt and BOTH the genny n VR are well grounded and the genny n VR are wired correct, do like Jim mentioned to dead ground the gennys field post n see if she charges better then????? ? If so I suspect a poor VR ground or the VR is bad or misadjusted..... ..if its no better leave it dead grounded and jump by pass the VR's Cutout Relay by momentarily wiring its BAT and GEN terminals together in case the relay has some carbon resistance. Once the field is dead grounded and the relay is jumped around the VR is basically out of the equation and any poor charging must then be a genny problem if not a miswiring or a bad ground or connection somewhere.

You sure the battery is good????? ? Had it load tested ??? A weak battery may not take a good charge you know!!!!! If the gennys brushes are bad or the commutator is all gummed over it can charge but be weak also.

My complete long winded troubleshooting procedure is posted probably 100 times below regarding charging problems but I dont think it would help much for you, check the VR and genny wiring and belt n grounds n connections AND ESPECIALLY FOR A BAD BATTERY and run the VR by pass checks and if thats alllll lll okay take a look at the gennys brushes n commutator and then maybe consider rewiring it as i suggested above as a 2 brush genny

BUT LET US ALL KNOW WHAT HAPPENS

John T