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Earl - The ONLY thing that will blow a current limiting device (fuse) in an automotive system is a short to ground (e.g., the hot lead (+12v) touching ground (in a car or truck that is any metal not insulated by non-metalic fastners from from the body, frame, or motor). Since you state it only happens when the truck is running, it suggests that (1) the bare wire is somewhere that it is unprotected (by the black tubing around some wire harnesses) and can move with the vibration caused by the engine running, road vibration, air flow in the area, or rotation of motor or wheel assemblies: or (2) water accumulation that moves around when the car is running and completes the circuit to ground when it comes in contact with the bare wire running from the brake switch to the brake lights. The easiest solution is to run a new wire from the brake light switch to the tail lights. If the fuse still blows, look for water in the tail light assemblies. I would suggest running the new wire, because, there is a remote chance that inside one of the protected wire bundles a wire from a frame member to connect and insulated accessory could be chaffed so that they can touch in the presence of vibration, motion, or air flow. Hope this will help you locate and/or fix your problem. Eric |
RV and bus conversion info since 1996.
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