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Discussion Starter · #1 ·
i trying to complete wiring of my undertail lights and running into a prob--the instruction say the undertails black and red led wires and the undertails white and black wire connects to the bike signal flasher wires the led work fine but the signal bulds dont light up if anybody out there have this undertail can you give me some assistants thanks
 

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Red is positive - Black is negative

I don't know which bike you have, but the colors usually don't match up to the factory wiring. Use a voltmeter, it's the easiest for sure way. Also, do not cut the undertail wires! Mine had in-line resistors installed and the LED's will not function without these in place. Likewise, if you removed them by cutting the wires to shorten the length, you've destroyed the LED's and need to replace them.
 
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