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2000 Mack 688 Horn Not Working

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So my horn  doesn't work and hasn't worked in some time on my dump truck and i have a few guys taking there road tests with the truck . When i push horn on steering wheel nothing. I found the horn mounted inside the hood passenger side with a wire broken . Great i thought easy fix, Nopeeeeeee. I test the wires and I'm not getting any power when i press the horn in the truck . I have no idea where to start looking . anyone have any ideas or diagrams. 2000 mack 688 dump truck.


Thanks and merry Christmas 

Edited by cfd511
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