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Old 09-30-2009, 10:15 PM   #1
boost junkie
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Default Radiator fan fuse keeps blowing

I recently stripped the wiring harness in my race car and after testing everything out, all was well so I went about bundling up the wires. Got everything bundled up and the first time I went to turn on the ignition there was a spark from the cabin fuse box area and the radiator fans turned on and stayed on. The rad. fan fuse was blown so I replaced it and tried the ignition again. Blew the same fuse again and the fans stayed on until I cut the ignition. Any ideas?
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Old 10-01-2009, 10:34 AM   #2
Cougar4
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The fuse that is blowing out must be for something other than the fans since they could not run with a blown fuse. You need to find out exactly what is on the circuit that is having trouble and track the trouble down. You may have a pinched power wire somewhere and it is shorting to ground. Whatever the trouble is it appears to be a hard fault so finding it shouldn't be too hard to do.
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Old 10-01-2009, 01:19 PM   #3
boost junkie
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Yeah I figure it's not an overload since I tried replacing the fuse with a 30 amp and it immediately blew as well. I'm going to have to pull the bundling back off tonight and trace the wire from that fuse. I have a feeling there's an exposed end on it that's shorting to ground.
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Old 10-01-2009, 02:19 PM   #4
dangerousatom
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- Check your AC triggering wires, they are the low voltage ones from the dash to the relays
- Check temp sensor triggering wire/wires from the crossover pipe sensor going into the ECU for proper voltage.....I believe its 5v or less?!?
- Yes it sounds wired but check and see if your back-up lights are working/if the fuse is blown. Or if there reverse switch/wires via the trans harness are cut mangled or even plugged in.


When I did my 04 STi swap I found a quirk in the reverse wiring and fan wiring ......if the back-up fuse is pulled in the lower dash and then the car is put into reverse the fans will go on and stay on until the fuse is replaced......popped my fuse a bunch of times till I figured it out.

Good Luck!!
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Old 10-01-2009, 03:01 PM   #5
boost junkie
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Quote:
Originally Posted by dangerousatom View Post
- Check your AC triggering wires, they are the low voltage ones from the dash to the relays
- Check temp sensor triggering wire/wires from the crossover pipe sensor going into the ECU for proper voltage.....I believe its 5v or less?!?
- Yes it sounds wired but check and see if your back-up lights are working/if the fuse is blown. Or if there reverse switch/wires via the trans harness are cut mangled or even plugged in.


When I did my 04 STi swap I found a quirk in the reverse wiring and fan wiring ......if the back-up fuse is pulled in the lower dash and then the car is put into reverse the fans will go on and stay on until the fuse is replaced......popped my fuse a bunch of times till I figured it out.

Good Luck!!
All of the a/c wires have been removed from the harness. And I doubt it has anything to do with the reverse wiring, the fuse blew immediately when I switched on the ignition. All signs point to a short since everything worked fine until I bundled the wires together, but I will check the temp sensor trigger wires as well. Thanks for the input.
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Old 10-02-2009, 08:12 AM   #6
boost junkie
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Figured it out last night, it turned out to be a 5 minute fix There are several green/black power supply wires that merge together right by the fuse box...when I cut one of them off I forgot to cap the end so when I pushed the fuse box back into place, the exposed end was touching the metal fuse box surround and grounding itself. Capped off that wire and all is well.
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Old 10-02-2009, 10:47 AM   #7
Cougar4
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Good deal. Thanks for the feedback.
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