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· Banned
2004 gmc
26,436 Posts
Bulbs are very hard to confirm visually - try a new one if you can't check continuity with a meter. PC boards that they plug into are a reliability problem as well. Harness sockets corrode and the pins in the circuit boards can get rusty. Aftermarket replacements available at the usual parts stores, it's not just a GM item.

Do either of you have a meter and know how to use them? I could post the pinout of the PC board if you want to check voltages.
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