alternator plug on 87 and 89

Discussion in 'The Garage' started by cmahometech, Oct 25, 2004.

  1. cmahometech

    cmahometech Registered Member

    Jun 26, 2004
    Likes Received:
    Wells, Maine
    I am swapping in an engine from an '89 blazer(with the serpentine belts) into an '87. The wiring harness for the '87 alternator has two wires going into it (a pink with black stripe and a brown). The '89 alternator only had one wire (pink). What do these wires control and what will the 87 computer want to see? Can I plug both wires into the alternator that was only using one before? I cannot change alternators because the older one had the v-belts and the newer is serpentine. /forums/images/graemlins/confused.gif

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