I'll say it again, you guys (jay_bob, TimFreeh,dieselbenz1) are awesome! Thanks for the great information!
Quote:
Another thing to try: get in, close the door, put key on position 1 (just the radio on).
Navigate to the MPH display on the cluster.
Push in the dimmer knob 3 times rapidly, you should see Ub = 12.xx V
Start the car and watch the voltage. If it immediately goes to 14.x V then the regulator is not communicating and it's in default (make nominal voltage all the time) mode.
If the voltage walks up from 12.xx to 14.xx over the span of about 15 seconds then it is getting orders from N3/9 to walk the load in. Meaning the LIN bus is working
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I will try this today. I just put a brand new AGM battery in the car, and tested the charging system. I get about 14.6 volts with my probes directly on the battery with the engine idling. Yes that tells me that the alt is charging, but it may be in default mode as you say. Again, VERY GOOD information!