What to do now?

[volkswagon]

PCM... The one on the passenger firewall is the one that controls the field... What you need to do is find out of if the blue wire has power and the green should be ground. If the crank sensor is not working right (tach) then the alternator will not charge.

Yes the blue has power, same voltage as the battery, and the green is ground.

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How about the alternator fuse in the PDC...???

This was the problem:doh: I wasn't aware that there was a fuse like this.

[Mopar1973Man]

Well its fixable... That's all that matters...

[tsmithnw]

It stops as soon as I let off on the throttle.

--- Update to the previous post...

Where can I find a wiring diagram for this? I looked in the downloads but couldn't find what I needed.

--- Update to the previous post...

Ok I tested the voltage at the sensor. 4.73 volts when grounding through the connector but 4.97 volts when ground the volt meter right to the ground on the battery. Could I be getting a poor ground to/through the ECM? If so how and where does it get its ground?

--- Update to the previous post...

Is there nobody reading on here today? I could sure use some input if someone has some.

My truck has been doing this same thing for the pass couple years. Mine will do it with my box and without and is off and on issue. Took it to cummins NW because dealership where i live well to be nice is retarded. I know more about the cummins then there tech does. Long story short my truck is defueling under heavy load aka foot on the floor. Computer is reading no more boost so it cuts the fuel. I had to get a boost fuller and little elbow. That what solved my issue.