To find the correct fuse:
1. Identify your accessory: What exactly are you trying to power? (e.g., a trailer brake controller, a CB radio, aftermarket lights, etc.)
2. Consult your owner's manual: The owner's manual for your 2005 Ford F-150 will have a diagram of the fuse box(es) showing which fuse controls which circuit. It's the best resource. Look for the fuse related to the accessory you're using.
3. Check both fuse boxes: The 2005 F-150 likely has multiple fuse boxes: one under the hood and one inside the cab (often under the dash). Check both.
4. Look for add-on fuses: If you've added the accessory yourself, the installation instructions should specify which fuse to use or where to connect the accessory. It may be a fuse in the under-hood box, or even an add-on fuse tap.
Without knowing the specific accessory, I cannot tell you the fuse location. Always consult your owner's manual first.
