My brake lights or running lights will not work on my 2003 coleman pop-up is there a fuse for them or ?

if you checked fuses, bulbs are good, and running lights work, then i would check the brake switch.

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If you mean running lights (not brake lights) check fuses first, then bulbs, wiring connection in trunk, light switch. If you mean brake lights, check fuses, brake switch at brake pedal, grounds at lamps, bulbs.

courtesy light fuse, but if it is a fuse then what made it pop. I would also check the dimmer switch and the multifunction switch.

You might have a bad wirre in one of the tail light housings.they get corroded and rotten

Check all your ground points. The brake lights and cruise may be grounded to the same spot. Re-check the cruise fuse and brake/tail light fuses.

maybe the one of the contacts on the bulb broke or the brake fuse

tail lights did not work but any other light did. In the engine compartment fuse box the EXT fuse is not there are instead there is a piece of rubber. If you put in a 10A fuse as described in the owner's manual then the lights run with the switch instead of being always on. Must be something wrong with DRL relay for the rear lights.

always start by checking fuses. look in your owner's manual for fuse box locations and fuse locations. check to see if you've got a blown fuse, if you do, replace it with the same amperage fuse. if the new one pops immediately, you've got an electrical short somewhere in the system. if the fuse is good however, check your brake switch which is located on your brake pedal arm under the dash. when the brake pedal is depressed, the switch opens, making the brake lights come on and releasing the neutral safety switch allowing you to shift from park. the brake switch is a common problem, but is a pain to replace in most cars. i recommend you take it to the dealer to have the work done if you have little automotive experience. the labor wont be expensive as it's about a 10 minute repair. and i think the brake switch is one of those parts only available at the dealership anyways.

clean bulbs socket out using the electronic spray cleaner for electrical connectors.

Have you checked both bulbs , also check closely on all the fuses. if you have to, use a test light and probe all fuses on both sides of the fuses