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The fan doesn't come on, even when the needle on the gauge is almost in the red. I unwrapped the wiring harness and searched for a shorted out wire and could find nothing. Right now we need the machine up and running so I rigged it to get it out there without overheating.

All of that checks out good. I can turn the key on and ground the pink wire and the fan comes on and you can hear the relay click while you do that, so I'm assuming the relay is okay. I even tried a spare thermoswitch/sensor I had and swapped that out on the motor. Nothing. I'm at a loss. So...

Thanks for all the help so far guys, I'm going to spend some more time today on the wiring and see what I can come up with.

Thats what I was just looking at, my pink wire going to the temp switch on the waterpump flange/head has got 12v going to it when the key is on and motor running?

We had to do a engine swap on our 2003 Kubota RTV 900 because one of our employee's blew the engine up by running it with no oil :bonk: Anyway, brand new motor installed, everything is working good except the alternator and electric fan aren't working right. I traced the wiring back to the...