01-02-2012, 11:59 AM
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CC Member
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Join Date: Jun 2008
Location: Chester Springs,
PA
Cobra Make, Engine: Kirkham 289 FIA #690, FRPP 427 Boss engine
Posts: 764
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Not Ranked
The 12v you are reading is feeding through the fan motor. The high impedence of your meter makes it look like there is 12v at the switch, but it is actually on the positive side of the fan motor. Sounds like you just need the correct therm switch. Here's one:
Zirgo ZFSWF - Zirgo Temperature Control Switch-Sensors - Overview - SummitRacing.com
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RCR GT40 SOLD to Fast 5
Kirkham #690 289 FIA
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