Ok you done a LS swap and want to wire in your trinary switch for your AC. Allowing your AC to control a fan. There are a few ways to wire your relays, allowing your AC to turn on a fan. Some will cause your E38 ECM to set a check engine light with a P0480 or P0481 code. This is how I wired my trinary and still allowing the E38 to test and control the low/high fans. Using three relays.

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