09-09-2010, 10:21 AM
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CC Member
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Join Date: Apr 2009
Location: Phoenix,
az
Cobra Make, Engine:
Posts: 848
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Quote:
Originally Posted by azfordman
Fuse is fine
10 ga wire used
Not sure what you mean by control circuit....but, there is power from the + connection to the starter relay....hot at relay & power from the ignition switch +....hot at relay & ground is good at the relay from the switch. No power comes out of the relay to the fan when switch is flipped...... If I put 12v to the fan connection at the relay the fan comes on. Fan is good.
Relay is bad......
I am sure the answer cannot be buy a new relay every other day.......
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I'm at loss, the only other thing I can think of is low voltage and Ohm's Law. If you have a lower voltage your amperage will go up. 40 amps at 12 volts will equate to 48 amps at 10 volts. However since it did not blow your 40 amp fuse, I suppose it can be you just happened to be lucky enough to get a bad relay.
Its also possible you could be getting a voltage spike in which case you may need to add a diode. http://www.the12volt.com/relays/relays.asp
Maybe the easiest thing would be to replace it and see if solves the problem  Maybe add the diode at the same time?
Last edited by Car Nut; 09-09-2010 at 10:39 AM..
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