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550f electrical help!

C
Nov 30, 2017
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Picked up a 05 gtx 550f and Speedo didn't work.. gauge lights stayed on etc, I've read up alot into this and decided to try a used Speedo from eBay with no luck. I also installed aftermarket grip warmers on the 1+1 seat, Wired it to the ignition switch and ground it to the tunnel. the bizzare thing is when I switch the warmers on, the lights are brighter and the Speedo seems to go back to normal.. still doesn't work but I suspect the speed sensor is shot, I haven't checked that yet. Does anyone have any input? Maybe a bad ground somewhere? Any help would be appreciated!
 
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