Hazard Switch

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
http://inboxjm.googlepages.com/home. Thanks!

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Relevant Pages

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