Brake lights not working & can't find any bad fuses,& brake light switch replaced

Check to see if the brake light switch under the dash at the brake pedal is bad before you go too much further.

THAT RIGHT IF BRAKE SWITCH BAD NO BRAKE LIGHT WILL WORK.SPRAY ELECTRICAL CLEANER IN BULB SOCKET BULB SOCKET COULD HAVE OXIDATION AND CORROSSION CAUSING POOR CONTACT.

I bet it is a ground disconnected or a bad fuse I really think it is a ground you should look up a diagram

There is a switch that is located above the brake pedal. It is called a brake senden switch. Make sure that it hasn't just lost contact with the brake pedal, that can happen, if it is bad, then it is a cheap fix

The flasher does not stop the brake lights from working. Check # 18 fuse in fusebox under lower left side of dash. if it's ok, the brake light switch, on the brake pedal arm is next. light green wire with red stripe is hot if fuse 18 is ok. Depress brake pedal, light green with no stripe should have power. if not, replace brake light switch. If light green wire has power with pedal depressed, combination switch under the steering is next. Remove the cover from around the combo switch {under the steering wheel}. depress brake pedal, light green wire should have power. If it does, pedal still depressed, orange with light blue wire & wire with light green & orange should have power. Those 2 wires are brake & rear turn signal wires. { The turn signal switch should be in the middle, not right position or left. while checking for power in the last 2 wires. Good Luck drvolt.

IF THE FUSES INSIDE THE CAR & UNDER THE HOOD HAVE ALL BEEN CHECKED WITH A GOOD FUSE TESTER, & THE BRAKE LIGHT SWITCH REPLACED, THE TURN SIGNAL SWITCH IS NEXT. THE BRAKE LIGHTS GO THROUGH THE TURN SIGNAL SWITCH SO THEY CAN BE USED AS TURN OR BRAKE LIGHTS. I'M ASSUMING THE BULBS ARE OK. REMOVE THE PLASTIC FROM AROUND THE TURN SIG. SWITCH. STAY AWAY FROM ANY WIRES THAT ARE IN THE YELLOW SLEEVE. THEY ARE AIR BAG WIRES. WITH BRAKE PEDAL DEPRESSED, THERE SHOULD BE POWER IN THE WHITE WIRE. IF THERE IS NO POWER IN THE WHITE WIRE, YOU MAY HAVE TO PUT A BYPASS WIRE FROM THE WHITE WIRE COMING OUT OF THE BRAKE LIGHT SWITCH TO THE WHITE WIRE GOING INTO THE TURN SIGNAL SWITCH. IF THAT DOESN'T MAKE THE BRAKE LIGHTS WORK, THE TURN SIGNAL SWITCH MUST BE BAD.

WITH A GOOD FUSE TESTER, TEST ALL THE FUSES FUSEBOX UNDER THE HOOD & INSIDE THE VEHICLE. IF THE FUSES ARE ALL GOOD WITH THE TESTER YOU MUST HAVE A BAD BRAKE LIGHT SWITCH OR A BAD TURN SIGNAL SWITCH. THE BRAKE LIGHT CIRCUIT GOES UP THROUGH THE TURN SIGNAL SWITCH & THEN TO THE BRAKE LIGHTS. FIRST OF ALL IS THE BRAKE LIGHT SWITCH GOOD ? THE ORANGE WIRE FEEDS THE BRAKE LIGHT SWITCH, THE WHITE WIRE PUTS POWER TO THE TURN SIGNAL SWITCH, SO THE LIGHTS CAN BE USED AS TURN LIGHTS OR BRAKE LIGHTS. , PUT A TESTER IN THE WHITE WIRE & PRESS ON THE BRAKE PEDAL. IF THE TEST LIGHT LIGHTS UP, BRAKE LIGHT SWITCH IS GOOD, BY THE WAY THE BRAKE LIGHT FUSE MAY BE LABELED" STOP", THE FUSE LABELED" BRAKE" IS FOR THE ABS SYSTEM. TO CHECK THE TURN SIGNAL SWITCH FOR BRAKE LIGHTS, REMOVE THE PLASTIC COVER FROM UNDER THE STEERING WHEEL, PRESS ON THE BRAKE PEDAL, PUT THE TESTER IN THE SMALL YELLOW WIRE, THEN THE SMALL GREEN WIRE. IF THERE IS NO POWER IN EITHER WIRE, THE TURN SIGNAL SWITCH IS BAD.

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.

First check the 25 amp fuse in the engine compartment fuse box. If that fuse is OK, contine troubleshooting below.

If the center brake light is working, check the 15 amp brake fuse in the cabin. If the center brake light is not working, the problem is probably the brake switch above the pedal. Take the connector off the pedal and use a big paper clip to connect the 2 terminals in the connector. If this turns the lights on, replace the switch. Let me know if you have questions.

Here are the numbers on your fuseblock and fuses coresponding to the number that is on your fuse block.
1-20 amp (yellow)
Hazard flasher
2-10 amp (red)
back up lights, A/C clutch cycling Switch
3-30 amp (green)
Power windows
4-30 amp (yellow)
A/C or heater blower motor
5-20 amp (yellow)
Panel Lights, Side marker lights, Park, Taillights, Clock & radio display Intensity, License & panel lights.
#6-10 amp (red)
Stoplight, buzzers, Anti-lock brake module
#7-15 amp (lt. Blue)
Tachometer, horn & Relay
#8-8 amp (yellow)
Power Door locks
#9-10 amp (red)
Radio
#10-10 amp (red)
Rear Wheel Anti-lock module, Turn Signals
#11-20 amp (Yellow)
Windshield wiper & washers
#12-15 amp ( LT. Blue)
Cigarette Lighter
#13-5 amp (tan)
Speed Control, warning buzzers, gauges, indicator lights
#14-5 amp (tan)
Time/delay relay & under-hood light, dome light, power mirrors, readio & clock Memory, Interior lights, reading lights
#15-blank
Not used
#16-4 amp (pink)
Radio Lights & overdrive switch light 1989-91, Cluster lights, Cigarette Lighter light & as tray light, Cluster lights, A/C & heater controls.
#17-relay
Hazard Flasher warning
#18-relay
Relay
#19-Circuit breaker
#20-relay
Turn signal Flasher
#21-buzzer
Warning
#22-Relay
Horn