Hello and thank you for your response.
To clarify, I am picking up the 9v in the wiring, but if I recall correctly, I also disconnected connector-1 of the PCM, turned the key to the "on" position, and measured 9v from pin-24, which corresponds to the Gen sense. Which is kind of odd since the B+ connections go thru connector-1.
Anyhow, today I searched for a 5v reference off the throttle body and only picked up mV's. I then proceeded to back probe the connectors and performed a voltage drop test on all B+ and grounds going to the PCM. Nothing but that 9v discrepancy showed.
It's an odd situation since it seems as though the computer is detecting the low voltage and is trying to push 100% duty on the field, but cant signal to the gen put out the target 14.3v.
I'm banging my head trying to avoid making an assumption on the PCM, but it keeps looking like the culprit.
-Tracer (power probe etc)
-Gen by-passing (ineffective)
-Scan tool (live data & live test)
-Duty cycle measurements on Gen connector
-visually inspected and wiggled Batt cables, grounds, and wiring (accessible ones).
-Powertrain verification test
-Transmission verification test
-Changed pigtail since the prior would lock the red tab.
Had to keep charging battery since it would run down to 7v @ 100% duty cycle. It makes no sense!
I haven't opened the wiring harness to investigate if the suspected wire is causing the issue since I performed a continuity test and power probe etc tracer through it. But I feel like that's the only stone left unturned.
Wednesday, June 23rd, 2021 AT 6:48 PM