Rear side brake lights won't work after fuses/bulbs replacement

The tail light fuse is under the rear seat on the drivers side.

The brake light switch is on top of brake pedal arm. Check your bulbs, and connections to the rear lights (unplug harnesses and clean the connectors as well as bulb(s) etc... )

Also, it (shouldn't) be the brake light switch if you can shift out of park. Good luck.

feed supply problem somewhere ?but where ? try checking the wiring loom at the rear or as its called in american "pigs tails"

Hi it sounds like a wiring short taking out multiple circuits check all fuses and recheck that you haven't melted the new part again it's unusual for these to melt unless they are being shorted out

try checking the relay and loose damaged wireing to to lights

I've got the same problem on 98 GMC Sierra.

I'm an electrical engineer, I checked the electrical diagrams and verified that there is no problem in the rear lamp assembly or wiring. With the light assembly unplugged, I can actually watch the blinker and brake signals operate with a voltmeter. The Tail light works OK.

It simply won't provide enough current to light the bulbs.

I'm afraid that it's melted one of a pair of normally closed contacts inside the blinker switch that feed the brake and turn separately on each side.

did you check you fuses or relay switch?

there is a fuse box under hood on drivers side. the inside of cover will tell were fuses are.

check all fuse for the taillights again, make sure all bulbs are good. it blink fast because a bulb is out.

check with a voltmeter at the bulb contacts while someone is hitting the brakes if there is no current. its the wire they rot and a discovery has daisy chained rear lighting. so if the left or is it the righ is bad. then they both wont work. either way if one goes they dont work. its not hard to run a new wire ive done it for car max a dozen times on these vehicles.