Can you post a picture of the LED lights you are using?
I am on the same quest, replace indicator, brake, and parking lights with LEDs. The lights I bought work with out any modifications to my wiring. Problem with these lights is they are too directional, the beam is not bright off center.
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Gordon
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'71 911 Coupe 3,0L
outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
Trackrash's Garage :: My Garage