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What are these connectors

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  • What are these connectors

    So I have these connections coming from the engine wiring harness and I can't find what there for. Can any one help. The round plug is found on the harness just under the alternator. The other yellow plug is about a foot before the ecm plug
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  • #2
    I don't have the exact answer, but I think I remember these being normal and I assume for some sort of diagnostic testing. Wish I had a better answer.

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    • #3
      Thanks for your help

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      • #4
        Both are unused for our purposes. The small one I believe is for ac clutch input to tell the computer to turn the fans on with ac but I maybe incorrect. Do NOT hook this up to the ac I cannot tell you what it will do to the computer. The other is for diagnosis I believe but again you will not use.

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