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Discussion Starter #1
I have a 2008 Mule 3010 and once the radiator fan turns on, it won't turn off unless I remove power from the radiator fan switch. I replaced the fan switch and the same thing happens.
  1. Cooling system heats-up
  2. Radiator fan turns on
  3. Turn the engine off and the fan continues to run until the battery is dead
  4. If power is removed from the switch, the fan will shut off and stay off when power is reconnected
I even bench tested the switch using a small butane torch and a multimeter. When the switch head gets hot, the circuit closes. When it cools off, the circuit opens.

Any thoughts on next troubleshooting steps?
 

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Discussion Starter #3
No relay. Battery to fuse to switch to fan and back to the battery. I'm leaning towards a bad switch as it was an aftermarket product. The OEM switch is $100, this was around $25.
 
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