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trainhorn

  1. GMC 2008 Sierra 1500 train horn

    General GM Discussions
    Hey everyone I need help as I’m adding a train horn to my truck but want to run it on a switch that go to my stock horn button on my steering wheel any idea I’m thinking of running it into a 5 way relay to a switch I have to find out how but when I switch is off I want my normal horn and when on...
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