you have to have power and ground to make a relay activate. almost every time I have come across your problem it was because the 12vdc battery feed to the relay had no power. take a test light and with the relay removed 1 wire should have 12vdc. (some have 2 wires hot) check that if you feel able and shoot me an IM. I've been a mechanic for several years and specialize in electrical problems.
Good luck
Roy
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