M1078 alternator regulator question

[Suprman]

Does anyone know where the alternator gets the sensing feeds to the regulator I have an issue with the 12v the sense line is reading low, and is causing an issue with regulation. I followed it into a bundle. The TMs don't really have a full schematic and there's no troubleshooting for 12v slightly low. The 24v is fine and pretty much picks up the slack. Interesting I was looking at the Niehoff site at specs it lists the M1078 alt as 12/24 100 amp but not dual voltage with separate current outputs for the different voltages like other models.

 

[NDT]

Did you see the post about the accelerator pedal abrading the harness and causing charging issues?

 

[Suprman]

No I didn't see it. I will look though. 24 volt is fine its the 12 volt sense line to the regulator. If I can find where it comes from I can run a new wire. It does not appear to come off the batteries maybe the power block under the spare tire.

 

[Suprman]

Checked that spot mine has the harness a bit different but no rubbing. I looked all around and in the dash didnt see anything shorted out. Gotta check the engine bay and where the wires go into the cab from the outside.