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Both. If the running lights ( marker, tail, clearence, or parking) and brake lights are out since the rain, a tail light assembly is broken and filling with water enough to create a short to ground. If there's no broken lens, whitch normally only blows the bulb. Then, the problem lyes in the trailer light harness. the brown wire (tail) & green wire (left turn/brake or yellow wire (right turn/brake) must be bare exsposed that shorts to ground when wet. all the trailer wires could be smashed together damaged the plastic coating on them. no problem till water shorts to ground. The white wire is the ground wire make its not able to touch the other 3 wires or bare & wet. Tape wires seperate then replace tail/mkr fuse and brake fuse. That should do it.
could be a number of things...check the bulbs in the taillights themselves if they are good see if your getting power to the tail lights make sure you have a good ground if your not getting power to the tail lights could be the tail light switch usually mounted on the brake pedal...hope this helps