short

I have a 2000 4.8 L ext cab 4x4 gmc sierra. Lately I have noticed my headlights dimming and even the dash/radio with it. Usually it was sporadic and I could never identify the source of the possible short. Well today I was driving around and it started getting dark. When it became dark enough...

What are the wires under the psgr seat for? There is a short causing the dome lights to flicker. Anyone have a wiring diagram they would be able to kindly scan? When i shook the wires I could see some sparking so I will need to address soon. Not sure if its power to the seat or just running...