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Scope's are really cheap now. Between my Picoscope, my Rigol, an old CRT scope, and a couple of hand held units I think I have about 5 or 6 scopes. https://www.amazon.com/Oscilloscope-Bandwidth-HO52-Multimeter-Auto-Calibration/dp/B08VRDG94N

I'm assuming you are using a DMM for voltage measurement? The DMM will not pickup transient voltage spikes and it will not show AC ripple - these alternators are very noisy and that's acceptable due to the brushless design. AC ripple up to +/- 2v is considered normal by Neihoff. You may not...

Yeah that doesn't sound right to me either. The E terminal only needs a momentary voltage input to "start" the voltage regulator. Once it starts, the VR controls alternator excitation and monitors voltage, load, etc - the AC terminal is a PWM output from the VR that indicates load. The VR and...

Should be a 3116 by the year. What does the diagnostic port look like on the driver's side kick panel? The A0 trucks have a 54 pin analog diagnostic port. The A1+ trucks have a 9 pin J1939 digital diagnostic port. All of them say exactly what they are on the valve cover. All options are inline...

Congratulations. You need a new mechanic. Options are 3116, 3126b, and C7 The 3208 is a neat little engine - 10.4 L V8. Would love to put one in an M1009...... not even close in appearance, number of cylinders, or vintage. Your mechanic....... well isn't.

Before you do anything else - fully charge each battery out of the truck and test them to ensure they are good. How did you try to bypass the LBCD? If you hook the 24v batt/load cables together one one stud, and the 12v batt/load cables together on one stud and disconnect it's cannon plug that...