I did something similar to my R56 and rigged the circuit to my brakes. I have 5 brake lights now.
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Nice - any pics or how you did it? Did you just splice the wires or did you do something magical? The GP2 supposedly has the rear LED fog light. Frankly, I have not had time to go out there and see. But I did get some more stuff migrated this weekend.
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I spliced them with cheap clamp splicers. Works really well - they come when the headlights are on and brighten on the brakes, wether the lights are on or not.
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