I hate wiring
Electrical problems 1974 dodge dart I had a small wire fire under the dash I think I’ve replaced everything bad but now alternator does not charge both field post on the alternator test positive when I connect a field wire to the positive side
I don't understand your test The two field terminals are each end of an electromagnet and are both insulated from anything else when disconnected
Do some simple tests.
Turn key to "run" with engine off. Don't leave the key on for too long, just long enough to do your tests
Disconnect green field wire, and use a jumper wire to short the alternator field terminal you just now disconnected (not the wire) to ground. should see a small spark in subdued light. "alligator" clip that wire to ground and start the engine, watch the ammeter. Also "rig" your multimeter to the battery so you can see it. Bring RPM up and ammeter should show a charge, and multimeter should "come up." Try not to allow it above 16V
If this happens, alternator itself is charging.
Now reconnect all wiring "normal." Move to VR. Disconnect connector, push it on/ off several times to 'feel' for tightness and scrub connections. Make CERTAIN VR is grounded. "Rig" a way to jumper across the two harness connector terminals.
Move back to alternator. This time disconnect the blue field wire. Jumper that wire to ground. Again start see if it charges. If so, this checks the field / VR wiring. If it works replace VR
HOW THIS WORKS. Both the VR and one of the alternator fields receive switched ignition power through blue wires. The VR green goes to the alternator field and "sort of" controls the grounding of that green wire. So power goes to the field (light blue) through the field, out the green, and to controlled ground VIA the VR.
IF NOTHING in these tests makes sense:
Go back to alternator. Disconnect green, jumper that alternator terminal to ground. With key in run, check voltage at blue field wire WITH the wire connected. You should have near same as battery voltage. if so make certain field is drawing current. Get car into subdued lighting, repeatedly connect/ disconnect jumper. You should see a small spark, might even hear it.
Run engine, check that it charges, and battery voltage rises. If not move your meter to the alternator large output stud. While running with jumper installed, if that voltage stays low, say 12 or below, it is not charging. Replace alternator
If voltage goes up and is higher than battery say 2 volts higher than whatever battery reads, then you have some voltage drop in the charging output path
If voltage goes WAY up say 24 or higher, and battery stays low down around 12, then you have a BROKEN path in the charge line.
