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Found my issue so sharing with others. although supposedly compatible, the new Sylvania 2057 bulbs were the final thorn in my side. Pulled them & installed some old GE 1157s i had lying around & everything's working again. Don't know if this is a Sylvania issue or a 2057 vs 1157, or perhaps a...

Hopefully w/o totally derailing Op's thread. I'm a bit unfamiliar with GM & their light socket design, is the wiring supposed to unplug from the back of the turn socket or is my discovery that i can easily unplug my ground wire from the turn socket a likely source of all my pain?

Talk about timing! The m1009 i just got in has the same issue (no left turn or side marker) & this post started me with the ground wire & tomorrow morning i'll check the side marker socket then onto the turn signal socket. Thanks so much to everyone on the forums here. EDIT: cause i'm...