Stopped Charging?

Ok let's start all over..........from the beginning. Obviously we are missing something here

1...Very first thing is to make certain that the field is grounded on one terminal, and that the other one is not SHORTED to ground. It is "too common" for rebuilds / replacements to have such things as missing hardware in the brush holders.

If you need to remove the alternator and if you still have the old one, test both Take your ohmeter and do a "short" test so you know what it reads at a short. Most meters do not read zero, they read some "tenths" due to innacuracy and due to probe / lead resistance.

Now investigate the alternator one brush should be grounded. Stabe one meter probe firmly into the case, and the other on the insulated probe. You should read fairly low resistance but NOT a short

2...Next "Full field" the thing and see if it charges and make SURE that the field is drawing current If you can, measure field current with your meter. "Rig" a wire from the battery (or large stud on starter relay) to the field, with the meter in SERIES. If the probes are long enough, you can just use them. BE CAREFUL!!! not to ground the meter, because a current/ ammeter goes in SERIES. "End up" with one probe on the battery positive, the other on the INSULATED alternator field. Measure current draw. Should be more than a couple amps, and perhaps less than 6. This varies over the years and with alternator amperage output

3...If the above is good so far, Hook everything up "normal" EXCEPT the green VR wire. Connect/ disconnect your field jumper---from battery to field--and in subdued light you should see a small spark, and maybe even hear it. SMALL. Double check your ammeter to be certain it is drawing current.

Now start the engine run at high idle, and monitor battery voltage. See if voltage increases. IF NOT move meter to alternator output stud and see what that reads

If still low, below 13, ----not charging

If quite high, VERY high up around 20, AND if voltage at battery is low, YOU HAVE an open/ bad connection in the charge path to the battery