TrailBeast said

Uh....................no


It's important to understand how these work and they are actually fairly simple

Here's the simplified diagram:

(came from here:)
http://www.mymopar.com/index.php?pid=31

These are INcorrectly called "dual field" correctly called "isolated field."

1 In the diagram, notice the top field TERMINAL has a blue/ white wire connected. This is UNfused "ignition run" power which comes from the firewall, same wire supplying the regulator IGN terminal and the IGN system from the key

This wire is HOT in "run" DO NOT GROUND IT

2 Notice the bottom field wire, green, going to the regulator. This is the "control" --the regulator controls "the amount of ground" so to speak on the rotor, which controls charging.

So the field is supplied 12V from the key, (blue/white) goes through the rotor, and controlled by the regulator (green)

3 For a QUICK check remove the GREEN wire and put the key in "run"

Hook a clip lead from the alternator terminal you just unhooked to ground. TAKE A test lamp or meter and measure the blue/ white terminal AND the output stud. You should have battery voltage at BOTH points

4 Start and run the engine, slowly bring up RPM and look for a charge increase.

IF this happens, you either have a bad regulator, or a wiring problem in the regulator circuit

IF no charge...................

With the test setup in place and the engine running, measure voltage at the output stud of the alternator. IF the voltage is low, below 12v,

5 Recheck voltage at the blue/ white field wire and recheck that the disconnected field terminal is still grounded. If no output can be measured at the alternator output stud the alternator is bad

(This could be an easy, or more serious problem. COULD be simply worn brushes. COULD be something more serious, bad rotor, burned stator, bad diodes, etc.

6 IF the voltage AT THE ALTERNATOR STUD is extremely HIGH and the voltage at the battery is still low, THIS INDICATES a break in the charging line

The circuit path here is --from alternator output -- through bulkhead connector --through ammeter circuit -- back out bulkhead on red wire -- through fuse link -- to battery

Your top suspects if this is the case, is the bulkhead connector, and the ammeter/ ammeter connections

Click to expand...