Need to find fuse box inside cab to replace brake light fuse. Brakes don't light up when depressed.

There is a push button switch that sits behind metal bar that holds your brake pedal. This switch is what turns on the brake light when you push on the brakes. Check to make sure that when the brake pedal is pushed that there is a short across this switch. If there isn't then the switch is bad.

If the center high mount brake light comes on when brake pedal is depressed, and the rear brakes don`t come on, and the fuses are not blown, then I would replace the rear bulbs.

replace brake light switch down on the brake padel/has short in it

THE FUSE FOR THE BRAKE LIGHTS MAY BE LABELED " STOP ". GM USES BRAKE FUSE FOR THE " ABS " HOWEVER, THE FUSES NEED TO BE TESTED WITH A FUSE / CIRCUIT TESTER, IN THE FUSES BOX UNDER THE HOOD & THE FUSE BOX INSIDE THE VEHICLE.

fuses all good?

The wiring also needs to be connected to the brake light switch. That's what actuates the brake box. You must just have a faulty connection if that's hooked up already. Check that connection to the brake light switch to the box. Has to be good continuity/connection.

Depending on where your truck was made you will either find the fuse under the gauge cluster or under the hood in the power distribution box. The fuse for the trailer lights is separate from the fuse for the truck brake-lights.

If they work when the turn signals or the hazards are on then you need to replace the brake light switch on the brake pedal bracket.If the lights don,t work on hazards but do with the turn signals,then you have a fuse blown.If none of the above work then you need to check the wiring under the truck box for a bad plug in connection,corrosion or broken wires.

The fuse would be in the fuse box. If the brake lights don't work check the bulbs and the brake light switch. The brake light switch is on the brake pedal and would have two wires. Check with a test light one wire should be hot then both wires when pedal is depressed.

fuse #7 is the brake lamp fuse. It also operates the rear antilock brakes and the buzzers.