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Had both turn signal bulbs fail within couple weeks, along with one marker bulb, and the other one was black but still burning. 63K miles '11 Lucerne. Is this normal, or more likely bad bulb supply at GM?
I put my Carchip recorder on it today. Daughter and friend going on a ~50 mile trip each way tonight. It is set to read volts along with other data and I will pull the data out when convenient. So it gives a reading every 5 seconds. If the volts are off, not much that can be done. Regulation is not done in the Alt like old school cars. I would guess it is in the body control module.