I have a 97 chevy z71 silverado. The dash and the tail lights won't come on when I turn the lights on. Turn signals, brake lights all work . Checked fuses in cab fuse box and under the hood all oka

SOURCE: wiring problems

Not sure just why you are looking for a wiring diagram? But it seems like you have a trailer hitch and the wiring was done in the dark! LOL Check here first for your trouble! Frankster016

SOURCE: Tail lights don't work on 1998 Chevy Silverado.

check the wiring from the tailights back to the fuse panel, it sounds like an open connection. if i recall correctly check under the dash on the drivers side near the fuse panel for a bunch of wires in a bundle and look carefully for a wire or two that are cut/shorted/or seperated, you can also check under the drivers side kick panel by the hood release.

SOURCE: Brake lights on my Chevy Silverado do not work but the Cab works

check grounds on rear light assy's

SOURCE: A/C quit blowing cold air after a loud squeeling noise stopped!

Look way down on the engine front area passenger side for the compressor.
Is the belt gone?
Check the belt tensioner pulley....can you turn it?....is it seized?
If it is OK then try and turn the compressor.......and the idler part of the compressor.
If the compressor is seized.....why?
Usually lack of oil in the system,or an overcharged system.

Once you have removed the 134a gas from the A/C system before removing the compressor and before installing the new compressor make sure you add the correct amount and type of oil into the system to prevent another seized compressor after you have flushed the system to remove contaminates such as old compressor grindings......if the compressor was seized.
You will also need a new receiver/dryer once you open the system to the moisture in the air.
Do not expose the new receiver/dryer to air....install last.
Vacuum the system well before refilling with the correct amount of 134a.
At 70 to 80 degrees outside temp........a vent temp at medium fan speed of 48 to 45 degrees should be a full charge .......use this reading if you do not have a electronic scale and/or A/C machine.
DO NOT OVERFILL THE SYSTEM.

SOURCE: 1999 Chevy Silverado - 3rd Brake Light Inop

if you can trace the wires and look for a loose jack or broken wire

Testimonial: "Thank you. I'm sure it's narrowed down to a wiring issue, but I am not sure how it is wired."