Charging issues

That is the simple "early style" (pre 70) just like came on the car. HOWEVER it is a LATE alternator (post 70) This means that one brush MUST be grounded. Remove the green wire and check with your multimeter between the two field terminals. Should show low continuity. On a "normal" post 70 alternator you want to then measure the field terminals to ground and see an "open" or "infinity."

But because you have the EARLY VR you want the opposite field from where the green is connected to be GROUNDED. You can either run a jumper wire to ground from the other field, or if you are careful, you can substitute a metal washer for the insulated one at one brush holder and ground that brush/ field terminal.

Try it again and if it will not charge..............then..............


Clip a voltmeter to the big output stud where the black wire is. Should measure "same as battery" 12.X V Connect a jumper wire from the exposed

Remove the green wire from the alternator. Connect a jumper wire from the that alternator terminal to the battery. Start car and monitor ammeter in car and your voltmeter. Voltmeter should climb up. Manage engine RPM and try to keep V down below 16V. Now move voltmeter to battery post and it should read same readings

If it runs "HIGH" voltage at the alternator but not the battery, there is a break in the circuit path from the alternator to the battery

If it charges and reads approx same at both points, and voltage can be brought above 14V then the VR is likely bad OR MAY NOT be grounded OR MAY NOT be getting power through the blue wire to the VR. With key "on" (run position) you should have battery voltage at the VR at the blue wire.