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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Do you have HP tuners? If so, you can turn the fan on/off by using their scanner/data logger. But as stated above, the Painless wire provides ground to a relay, that triggers the fans to come on.