This on the Firebird?
And what do you have for bulbs in front turn/park?
Factory ground didn't go straight to ground. It went through the front turn signal bulbs. That made the front side markers alternate blink/flash with the front turn signal.
Resistance to reverse flow through a LED park/turn would make for a dim side marker light.
Can't add ground without cutting the factory ground through the turn signal bulb. Ground added to existing would blow the turn signal fuse when you used them.
Clay
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