The brake lights on my 2005 Silverado Z71 do not work while the tail lights and turn signals all work. Have repalced the bulbs and still do not work. Put in known working bulbs that do not work in this socket but work before and after trying in the brake lights. I would appreicate your assistance.

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: 2005 Chevy Equinox Brake Lights

replace all the bulbs (front and rear) and see if that fixes the problem. Not the headlights

SOURCE: 1995 chevy silverado z71 no power to right tail light

check fuse.if good you got grounding problems or faulty turn signal switch.

SOURCE: NEED TO REPLACE A TAIL LIGHT BULB IN A 2005 CHEVROLET IMPALA

and Repair Notes TAIL LAMP REPLACEMENT REMOVAL PROCEDURE Open the rear compartment. Remove wingnut and pull back the rear compartment trim panel from the tail lamp. Remove the wingnuts from the tail lamp. Remove the tail lamp from the rear body panel. Disconnect the electrical connector from the tail lamp. Remove the tail lamp socket, turning counterclockwise. Remove the bulb from the tail lamp socket. Remove the sidemarker lamp socket, turning counterclockwise. Remove the bulb from the sidemarker lamp socket. INSTALLATION PROCEDURE Install the bulb to the tail lamp socket. Install the bulb to the sidemarker lamp socket. Install the sidemarker lamp socket, turning clockwise. Install the tail lamp socket, turning clockwise. Connect the electrical connector to the tail lamp. Install the tail lamp to the rear body panel. Install the wingnuts to the tail lamp. Pull back the rear compartment trim panel to the tail lamp and install the wingnut. Close the rear compartment.

SOURCE: how to replace spark plugs on 2005 chevy silverado

spark plug wrench and alot of patients with the very back ones hard to get to