I have a 1992 Dodge Ram van b350. all of my lights work except for my brake lights, I changed the brake light switch on the brake pedal with a used one only because I am leaving for vacation in 5 days and could not get a new one shipped in time. It did work and my brake lights worked for one day. today my brake lights no longer work again. I have power at the fuse box the fuse is good, I am getting current before the break light switch plug and after the break light switch plug. Any help would be greatly appreciated

 

The power runs from the brake light switch up to the turn signal switch. If the TSS is worn it could prevent the power from getting through to the bulbs. Try moving the TSS lever around while applying the brakes as someone watches the brakes lights for any sign of life.