Fan not switching

#1 · December 15, 2018, 7:42 pm

I have just fitted an frtermarket electrical fan. If I run the fan straight to the battery it works, when wired through a relay nothing.

i have switched on the fan in the handheld and sent to ECU, I also adjusted down the on off temperatures, but nothing.

i followed the Fitech instructions for wiring the relay, battery power pin 30, power to fan 87, power from ignition 86 and yellow Fitech wire to earth 85. I earthed the fan.

Has anyone any ideas why it won’t work?

Thanks Mark.

Mark johnson

#2 · December 16, 2018, 6:44 am

I would run a jumper wire from 85 to the negative on battery. This will trigger the relay. Also make sure you have a 40 amp relay. Electric fans draw a lot at startup.

Let me know.

#3 · December 16, 2018, 3:49 pm

Thanks....Just to confirm.

85 will have both the yellow and the earth to battery on it??

Thanks Mark

Mark johnson

#4 · December 16, 2018, 4:11 pm

Yes, it won't hurt anything. Just takes a few seconds.

Trying to narrow down where the problem is. See if it is the relay or something with the unit or settings.

#5 · December 16, 2018, 11:36 pm

Used the jumper between pin 85 and battery neg.

Could here the relay clicking but no fan.

Your thoughts????

Thanks Mark

Mark johnson

#6 · December 17, 2018, 12:37 am

Bad relay if hooked up correctly.

#7 · December 18, 2018, 2:10 am

well, if all else fails read the instructions. Ones I replace the blower 20a fuse with a 40a it all worked.

thanks for your help.

Mark johnson

#8 · December 18, 2018, 8:47 am

Dont be too hard on yourself. We have all been there. I damn near rewired my entire system one time, was about to call Fitech for warrantee. I forgot to tighten the carb studs, causing intermittent ground issues. I had been stressing for days.

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Fan not switching