I have a 1998 GMC Jimmy and my brake lights will not work.

conniep1

I have changed the brake light switch and checked all of the fuses that I know of, everything else works very confused help

Mr_Shiftright

Let's put a test light on the connector that plugs into the rear lights to see if there's any voltage back to them.

imidazol97

The circuit has more than one fuse whether it's a pickup or a utility vehicle.

Does the center taillight work?

conniep1

We found the problem and could not believe what it was. It was the multifunction switch. In lay mans it was the signal light/ windshield wiper switch. Looking at this thought there was no way.

conniep1

And yes center taillight worked

imidazol97

conniep1 said:

And yes center taillight worked

That was the reason for the question. The multifunction switch could be bad but the center taillight
would work. It all comes down to checking voltages if you can find the right wires in the right
places to try to isolate the bad part, wire, or fuse.