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Discussion Starter #1
I replaced it with a new 2010 rzr unit everything works except speedo. I tested hall effect ok using batt, led, and wrench off bike. When I ride still no mph, hours-awd-fuel-lighting ok. Waiting on ecm as it is over charging 18+ v. I tested voltage out to hall effect ok. Think it is? At $70 bucks anyone use quad logic unit? TIA
 

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Discussion Starter #2
Replaced the ECM over charging fixed! Speedo still inop. I tested as per manual and sensor passes. hooked up an older unit and speedo works! Tested rzr speedo unit and it passes as per test for voltage a-c and b-c. Any electrical wizzes got any input? TIA
 

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Discussion Starter #4
I found a wiring diagram for an 08 rzr that shows the internals of the speed sensor, if only they did that for the quads. The rzr sensor does have two connectors, one on each end and the black wire crosses over at the sensor. I wonder if i should swap those?
 
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