Headlights problems of the 2001 GMC Sierra

Many problems: 4 wheel drive sensor, front end suspension, parking brake, service brakes, anti-lock brakes, speed sensors, radio, center console, engine noise rapping when starting, tailgate cables, anti-theft sensor, and now the battery voltage gauge needle excess dropping when stopping, engine idling to low when stopping. Dealer says problem is normal. Let's test drive a new truck and show me it is normal. This truck is a lemon in my eyes!.

While driving at night, consumer pushed dome light over ride button, immediately headlights and dash lights went out. Vehicle was taken to dealer, GMC was contacted. Manufacturer stated this was the design of the vehicle. To press again 4 times within 6 seconds. This would prompt all lights to come on again. There is a section in owners manual where this fact is mentioned, but not in clear terms. Dealer could not fix.