Brake light fuse blowing?

The way your lights are set up doesn't share those circuits. The brake fuse goes to the brake switch and from there to other modules. The interlock is controlled by the body module as in the second image. All the items are shown in the third image. The items that are directly controlled by the brake feed are the rear brake lights, the high mount brake light and the rear trailer connector. All of those are fed from the same brown wire. A common failure point is in the trailer connector wiring. The next is in the high mount light. If it blows the fuse only when you step on the brakes, you might be able to use a short finder to track it down. They are easy to use, you connect them in circuit replacing the fuse, the circuit breaker inside then starts turning on and off when the power is on (in your case you would step on the brakes) now you run the detector along the wire in question and watch the needle, It will bounce around until you get to the short or past it. The other option would be to start disconnecting the lights in question, like the high mount lights and the rear brake lights one at a time and see if the breaker stops tripping when you unplug one.

Thank you for the reply. Wiring is becoming more problematic every year. I think it's because the insulation is much thinner and when they wire the harnesses they don't notice small holes or tight spots and the moisture gets in and corrosion sets in, that's the only reason I can think of why a harness that hasn't been touched after it was built ends up with corroded sections under a taped harness with loom over it.