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    Boat Horn Confusion

    Hello All, I'm trying to troubleshoot the horn on my 2004 Tahoe Q7. If I remove the horn from the boat and connect it to a 12V supply, the horn works. Using a multi-meter, when I press the horn button with the power switch on, I see ~12V so I'm assuming the horn switch is working correctly...
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    2004 Tahoe Q7 5.7L Ignition timing

    Hello All, I have a 2004 Tahoe Q7 with a 5.7L Merc and Thunderbolt V ignition. I'm trying to check/adjust the ignition timing. I read on some other forums that I need to ground out the purple/white wire to put the ignition in base mode and cancel the advance. I thought the wire was...
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