Re: Only Highs...no lows.
Then check for ground signal coming from bcm to the relay. If no ground check for ground signal to the bcm from the switch, if no ground from switch you will need a switch, if you have ground from the switch and none from bcm to the relay you need a bcm
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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