Charging issue 68 barracuda

OK separate the problem

1....You have the components, the VR and the alternator

2....You have the output circuit, the "charging path" the big black goes from alternator output, through the bulkhead, through the ammeter, back out the bulkhead, and ends up at the battery

3.....You have the field circuit.........from the ignition switch "ignition run" comes out the bulkhead, branches off somewhere near to feed the VR, the ignition and depending on year, one or two other things.

So...............a few easy tests, part of which you did

A.....Remove green field wire, AT THE VR, and jumper it to a battery source, IE the "big stud" on the starter relay. Depending on engine RPM it should charge "full output." Go easy on RPM Doing this also confirms the green wire/ connections is OK

B.......With the above set up, run the engine to simulate low/ med. cruise. Monitor battery with a voltmeter, try to keep it below 16V. Measure battery voltage, then measure alternator output stud. Should not be more than say 1V difference, the less difference, the better

C.......If A, B are OK, the alternator, charging wire, and green wire are OK
Now with VR disconnected as before, jumper the blue and green together, it should charge just like "A" Does not hurt to check that blue supply.........so.........with key "in run" engine stopped, measure from blue VR "IGN" wire to battery PLUS. This should result in a VERY low reading, less than .3V. If more, you have voltage drop in the harness / connections

D.......If the above is OK, make CERTAIN the VR is grounded. Clean, scrape the flange and firewall and remount TIGHT with star lock washers. The VR MUST be grounded.

E......IF the above does not give results, you MAY have a bad field drawing too much current, and blowing up the VR. Set your meter up for amperage, BE CAREFUL.......Easy to eff up a meter. Post the model and photo of your meter, we can step you through that...........

Get a service manual from MyMopar and read the section 8 on alternators. There is a procedure to measure FIELD CURRENT. You want to put the field in series with our multimeter (current) to the battery. If it draws more than 6A there is something wrong