I got my 77B with only one electric fan and when it failed I replaced it
with a 12" fan from Imperial. Instead of using the sensor that Imperial
supplied I decided to use the temp sensor that powered the fans in the car.
After testing the wires, I found that the temp switch was positive
(confirmed with the wiring diagram as well). I snipped the black wire from
the switch to the OEM fan and connected this to the new fan, and then ran a
new ground wire. This ran fine for a week but then the fan died. After a
few minutes of poking around I found this:
6V current was running through wires, but when I connected the fan it
dropped to 0 with no fan action.
The wire coming from the temp switch was now ground???
Running a line directly from the 35 amp fuse ran the fan fine, using the
same ground wire.
What happened???
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