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Discussion Starter #1 (Edited)
I've got 08 sportsman 500 ho efi runs great when lights are off but when I turn lights on it won't idle and runs like crap and when you push throttle all way in it chokes down with lights on and back fires and some days it cranks fine then it clicks like battery is dead but it's not
 

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Have you checked the wiring from the light switch all the way to the lights?
 

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Do you have a meter that you could put on the battery to check voltage while it is running?
 
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