Re: Need Help! Hummer gone nuts!
If the radio has an interface to allow for door chimes, onstar to work, the interface could be corrupting the data line. I would disconnect wherever they tapped into the data line and see what happens. Likely tapped in behind radio somewhere. If its spliced into the factory radio connector would be an orange wire. What year of truck is this?
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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