Honda Shadow Radiator Fan?

Since spring came around and I've had the chance to get my motorcycle ready to go back out for the year, I've found that my radiator fan isn't turning on and the overheating light just turns on.

I bought 2 different radiator switches for my 2003 vt750dc and neither of them managed to get the fan to turn on. I have also checked the fuse, cleaned the radiator, grounded the wire that is going to the switch, and the fan does turn on. Also, with both new switches I made sure the over heating light came on although I could tell that the bike was getting too hot before the light came on.

I don't understand why neither of the radiator fan switches worked, admittedly one was a $5 part from eBay and the other was $15 from a salvaged shadow on eBay. I was wondering if I'm missing anything or if I just need to try my luck with a brand new OEM part? Also if most Honda dealers carry this part or if I need to order it from somewhere?

(Yes, I made sure the part numbers matched on the switches)

Attach a bulb and battery to a test rig with the switch/thermostat, drop the thermostat into a pan of boiling water.

Then the problem probably isn't the fan switch. Is there a fan relay on that bike?

Sounds like a bad temperature sensor or broken wire, Use a volt meter and check the wire Be sure you are replacing the temp sensor in the radiator not the one for the gauge.

Get a test light and/or multimeter/DVOM and start testing for voltages/continuity. You will not go anywhere if you are not doing any tests. Pros do not guess, they test and find the failed part.

Unplug the wire from the fan switch.
Turn on the key and touch that wire to ground.
The fan should start running.

If it doesn't run, check the fan fuse.

I assume that by "switch you mean the thermostat that will turn the fan automatically on when temperatures arise.

You should check the liquid coolant pump. It the LC is not circulating, the bike will overheat.

Make sure you're using a respected liquid coolant brand.

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