What have I done - A side blinker story

RedFish said

It's been a very long time since I messed with this lighting setup.
If I'm not mistaken you have to reroute the factory ground path so the only path is through the little marker lamp bulb.
Not so easy to try if you have chassis grounded metal fixtures such as your fender top fixtures.

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This stuff can REALLY throw ya. When I was in the navy, several friends had mid 60's chivvies, which have part of the lamps mounted on the trunk LID. These cars were a nightmare to keep the lights working, until you solder grounds to the lamp shells, and run a flex ground wire from the trunk lid to the body.