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what would plug be for?

Discussion in 'Fisher Engineering Discussion' started by chevyzrule810, Jan 15, 2012.

  1. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,288

    2011 chevy 2500HD with straight blade 3 port isolation module.The first port has a plug that comes off the harness and has a cap on it but doesn't plug into anything.What would would that plug be for?