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08 EVO 883xl sporster, purchased this used bike, turn signals would not work TSM was bad. Found the correct TSM and dealer programed it. The sinals I took off were 3.8v led. Replace LEDs with standard 12v incandescent OEM. Turn signal indicators on the dash work. Signals are only getting 8v of power. I believe something was installed to cut power back the voltage for the 3.8v led lights. Now it’s driving me Waco.
 

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Look under the seat behind the battery for an aftermarket ballast module used to get LEDs to function correctly. The modules are mostly black and about the size of a Zippo lighter.
 
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