Quote:
Originally Posted by dme922
I am using a painless harness on my 5.3 swap and i cannot get the fan trigger wires to start my fans. How can i check the fan trigger wires to see if they are working at the ecm set temps?
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The fan trigger wires are a ground trigger for the relays . If you have the temp gauge plugged in the ecm should see what temp the engine is . Once the temp gets up the ecm will ground that wire . I would think you could use a meter on the trigger wire ( ground ) and to a +12 and see it come on . Green for low speed and blue for high speed .