No brake light looking for a wire diagram to trace the problem. checked bulb its good, fuse?, not sure where to look?

I would start by tracing the tail light wire harness. Where ever it passes through a body hole or grommet look for pinched wire or cut in wire. The bulb sockets might also have an issue so run a continuity check between ground and the connectors in the light plug socket. also check bulbs and make sure they are not damaged or bad..

Check to make sure you have a good ground. From there, you need a circuit tester light w/probe to trace back. Look for a broken wire.
Good Luck.

must be a wiring problem ,trace the wiring looms from rear light clusters and make sure that the earth wire has a good contact to body/chassis,check bulb holder for wires,condition as can get brittle and loose connectivity,if those ok bridge the contacts from brake light switch if do not come on there is a wiring fault/loose connection some where in the circuit

This may sound confusing, so here goes.
Normally I would say check the turn signal switch because for decades the brake light switch power went thru the turn signal switch.
But in your case, its more complicated.
The wiring diagram looks like you have a wire from the brake switch and another from the turn signal that joins inside the right and left rear tail lamp assembly. There are also fuses in the rear fuse box including one for just the brake lights. So its possible that fuse is dead and yet the turn signals would work.
You may have to get a book with the wiring diagrams to trace the circuits.

Get a test light and check for power. If you got power check the ground, and the contacts, if not follow the hot wire back to the brake switch to locate the short.

here is a wiring diagram. Are the bulbs for sure good?


hope you can read it.

is it both lights? If yes, check 15 amp stop light fuse first. If good, check brake switch above pedal.

If only one brake light isn't working, you have a broken wire. See diagram below to trace wires.

Check your fuses underneath the drivers side steering wheel. Flip the plastic cover over and there will be a diagram showing the fuse that controls the taillights/stoplamp. Pull the fuse out and replace it with the same number fuse and your taillights and brake lights will work again. If the fuses are ok, pull each taillight bulb out and replace it with a new bulb. Sometimes when one light bulb fails, all of them will fail.

Hello.
This sounds like you have a bad ground on your Dakota. Trace the wires back until you see that one of the wires is connected to the body or frame with a small screw or small bolt. Make sure that your have a good clean ground to work with.
Another thing that you can check for is to see if there is another light out somewhere else on the truck. Its like christmas lights, when one bulb goes, it can effect all the others just as well. The only other option is to check your fuses, get the fuse diagram and see what controls the taillights. On my truck I have the wrong fuse in there cause only the taillights to work and not the brake lights. Vehicles are very picky with there fuses. If the correct fuse is in there, make sure that the fuse isnt burnt out. You can check that by seeing if the filament in there looks burn or is broken like it popped. Hope this helps!
-Steve

Lets keep it simple if the wiring harness is in good condition lets not look at that... first check your fuse if the fuse is good... check for power... if you have power coming and going from the fuse then check your brake switch ( located under the dash) attached to brake pedal. Please make sure your light bulbs are both good also. If your brake light switch is good and you have tried everything else it is either going to be in your 4 way switch or wiring harness