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Dome.... Gm liked to break up functions and run them on various circuits to give some redundancy.. Thus why your light functions have been broken into 4 or so different fused circuits, coutesy lights, stop, etc...
for the one that is, check the grounds which is literaly the casingfor the entire assy...make sure theres no random wire jsut hangin back there...mine was like this, the pwoer wire got cut and kept shorting out the circuit. never could figure it out till i pulled the whole cig lighter assy out on purpose. LOL
oh and to make sure its workin get a tset light or volt meter. adn put the pos in teh VERY center of the shaft on the brass pin in the bottom. ground other obviously.