i have a 72 duster it wouldnt turn over the battery was down i had the altanator checked its fine and replaced the volt regulator and its still not charging any help would be great

 

OK, best if you have at least a test lamp or meter

The alternator should have three wires, the big main charging lead hooked to the stud

and two push on connectors. Does not matter which wire is hooked to which alternator terminal.

Turn on the key, and pull off the regulator connector.

Probe the two connections, they should both show "hot"

If not, determine which one is not

If it's the green, go down to the alternator, and pull loose the two push on connectors.

The blue one should be "hot.

If so, put it back on the alternator, and probe the remaining "push on" terminal. If it is not hot, the brushes are bad, or the rotor is "open."

If all this checks out, next,

take a clip lead and remove the GREEN wire at the alternator, and clip this to ground. The blue should still show "hot" and the clip lead should make a small spark.

Now start it up and see if it charges. GENTLY increase the RPM and see if the ammeter goes up.

If it does, you probably have a wiring problem with the regulator

If not, you may have a wiring problem from the alternator back.

Again make sure the blue is "hot," key on.

If so, you may have troubles in the bulkhead connector where the charging lead feeds through to the ammeter.

You have a wiring diagram?

 

i tested the regulator plug the green one was not hot the green one on the alt also wasnt hot the blue was i replaced the alt with a new one it still doesnt charge the amp gauge doesnt move much when start or turn lights on would the amp gauge give me this problem i also lost my temp and gas gauge

 

i grounded the green wire side of the alt and it charged the amp gauge moved to charge now where do i go from here any help would be great

 

OK, I assume you grounded it AT THE alternator? IF so, check the continuity of the green wire, which only goes one place --to the green at the regulator. So you should be able to ground it up at the regulator plug and it should charge "full output"

Make sure you have switched ignition power (battery) to the other terminal at the regulator plug

 

To sum this up, you have:

switched ignition at the regulator terminal that is NOT green
switched ignition at the alternator field that is NOT green

Both of those terminals should be hot with ignition in "run."

Since it charges by grounding the green, you know it's OK at the alternator

This leaves

a bad regulator (new does not mean "good.")

a bad green wire

no ignition voltage at the other terminal at the regulator

Make SURE the regulator is well grounded.

 

thank you for your help the new regulator i bought was bad i never would of thought of that . that grounding the green side of the alt showed me it was bad thanks again

 

Glad you found 'er

 

I have A 76 Duster With Charging problems I believe The New voltage regulator could be bad. The Alternator works checked the whole wiring system. Except for the dashboard wiring. The amp meter could be bad. or the load relay could be bad. No broken wires when checked with ohm meter. The Alternator is new. Also Does anybody know where to get a clutch flywheel for the 225? I will get to the bottom of this charging system yet. I get about 4 starts with a full charged battery. average 35 miles with three stops. I also checked the fusible links.

 

Monte, you need to start a new thread for this.