Couple alt/reg questions
run a grounded jumper wire and touch it to the field [green] wire meanwhile having a volt meter reading the output, if it jumps up to 16 or so, the alternator is good and you need to either find the break in the wire or replace the regulator.
Incorrect, from what I see here. The picture he posted APPEARS to be a 69/ earlier vehicle, is that correct?
"Quicky" checks:
Sounds like you are OK on the output stud, but the deal is, in the end, there STILL could be an "intermittent" or other poor connection, that when measured with a meter and NOT UNDER LOAD, will show "good."
Look carefully as someone else mentioned, at the alternator. Make sure there is NOT another field terminal (the small push on connector(s) that is UN connected. If so, ground it.
You seem to have an early alternator.
Check at your regulator, key on, in "run" one lead should be blue and marked "ign" and the other should be green, marked "FLD". BOTH terminals should have close to battery voltage on them with the key in run.
If not, you have a wiring problem
If you do not have 12V on the green, you probably have a regulator problem.
To check this alternator for at least "some output" and HERE AGAIN I'm thinkin you have a 69/ earlier?? What you want to do, is pull the green wire off the alternator, and then.......
put a clip lead from the exposed alternator terminal (push on) to the battery stud.
Start the engine and gently rev it a little. As you increase RPM, it should put out more and more, at "low cruise" should pretty much peg the meter.
If this is OK, and if you had battery (in run) back at the regulator IGN terminal, looks like you need a new regulator
EDIT. Just looked at the very top of your alternator in the picture. It APPEARS that I can see the grounded brush mount---the empty hole--with nothing in there. IF THIS is true, it either means that
the grounding brush is missing, or......
you have a typical rebuilt whereby a rebuilder modified the original to turn it into an "isolated field", that is, TWO small field push on connections. IF THIS is the case, as someone above said, just ground this second connection---it matters not which one you ground
