1996 GMC Vandura 3500 Questions

All 1996 GMC Vandura 3500 Questions

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It just started. The engine is running fine. I got the fuel where I normally do. I added some fuel additive that is suppose to help. I also disconnected the battery for a hour to see if it would reset, but it did...
he can't find a wiring diagram and needs to know how to fix the horn.
please help ,i try a lot of mechanics, i don't what to give up !!!!!!