You have an electrical short somewhere. I would first look at each park light bulb, front and back. If all are good and not installed backward then look for a wire that has a frayed spot where it has rubbed against something.
Process of elimination.
They don't
Because the power for your headlights is pulled from your battery. When the dashboard lights dim after turning on the headlights the dashboard lights aren't getting as much power as they were with the headlights off. With the motor running or off? The headlights draw a lot of current, but should not visibly affect other systems. There could be a problem with a worn out battery, an alternator that isn't charging correctly, or you have a bad earth between the battery and the chassis. Check the large cable connection between the battery (usually negative these days) and the bodywork, or between the engine block and the bodywork.
no
The headlights on a 96 Chevy Silverado are adjusted by turning the screws on the top and side of the headlights. It allows the lights to be adjusted for optimal night vision.
try turning your dimmer switch Also check your wiring, in my 89 LX it has the digital dash and that was the problem
From th einside of the trunk there are three plastic wing nuts that hve to be removed in order to remove the taillight. Once the taillight is out You can remove the bulb by turning it Counter clockwise.
Turning on the headlights with the engine turned of.
If it isn't turning over then it may be a problem with your starter motor. If it is turning over but not starting then it could be a range of things. Fuel pump would be one thing to check. If you turn on headlights and they are very dim then it could be that your battery is very flat (but enough charge to still run the dash lights as they are a much lower power rating then headlights etc)
There are three headlight settings on your headlight switch. You can turn the low beam headlights on by turning the headlight switch.
I would suspect the switch...It is 20 years old.
If you're referring to your headlights turning yellowish or fogging over use polishing compound and rub the heck out of them and if you do it right they will look as good as new. When done with the rubbing compound apply some good wax to protect them longer. The fogging of the headlights is a common problem.