wiring in my contour fans. I have 2 relay and I am running a fi-tech injection. Basically the ecm turns on the relay by applying a ground to the relay. Pretty simple. However I need 1 of the fans to turn on with the ac which is triggered by a positive signal. So do I need to add another relay?
Electric fan wiring
- Thread starter Blue85
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Assuming you're running your two relays from an ignition source and the ECU for ground, the easiest thing to do would be to bypass one of the relays with a third so, yes. You would use the third relay as an A/C switched ECU ground [clone].
So if I understand your set up correct, you have two relays, one for each fan. Your ECU grounds both relays to trigger both fans. What size are the relays?
Do you run the fans on high speed only or do you use the thermoresistor in the fan shroud for low speed?
Do you run the fans on high speed only or do you use the thermoresistor in the fan shroud for low speed?
I run 2 70a relays. One for high, one for low(using the factory low speed resistor), ground triggered by temp switch....and then a standard 30a relay as a high speed change over relay for the ac trigger(positive ac signal triggers the relay to provide ground to the high speed relay)
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