I am trying to figure out the electrical system on a 1997 GMC Sonoma pick-up truck. The problem I'm having is trying to understand the schematic diagrams. I have a set with bit more detail from Haynes. The diagrams depict the SUV which is similar. The area of interest is the Hazard/Turn/Stop functionality. The rear has one bulb per side with a filament for tail illumination and another filament for Stop/ Turn. The front has one bulb per side with a filament for parking illumination and another filament for turning. Also, there is one sidemarker per side in front which integrates both parking and turning functions. I understand how the brake lights work with and without the turn signals on. I have also read about the strange way the turn signals work with the parking lights. Although, I think the schematic is incorrect. The real problem I can't figure out is when the hazard lights are on and I apply the brakes, all the lights that are flashing remain on (front, rear, and dash). This allows someone to know your braking when the hazard lights are on. But what makes it happen? I can't figure it out from the schematic. Is it me or the diagram? Can anybody figure it out? You can find my wiring diagrams at
- posted
16 years ago