So the shop where I was getting all the problems associated with my check engine light fixed let me know that the only lights working were my blinkers and my headlights. Before I had dropped the bus off though, I had noticed my power mirrors weren't working (first major clue).
When testing my brake lights, the first place I checked was the brake itself. I depressed the brake, and I could hear the relay click whenever I did. So the brake switch was working. I then checked the fuse for the brake lights and it was perfectly intact. I checked the bulbs and the bulbs were fine as well. I checked all the harnesses and wiring to make sure there weren't any loose or bad connections, and everything was fine. But when I realized my taillights weren't coming on as well, I figured the problem had a little less to do with the brake system.
Then I remembered the problem I had with my power mirrors, which run off the same fuse panel as the brake light power. I listened to hear if the solenoid clicked on whenever I turned the ignition, and sure enough it did, so I was relatively sure that wasn't the issue.
I had previously fried the fuse on my multi meter when I was working on the AC system, so I didn't have a working one at hand. I had just dropped $2800 on my repairs, so the less money I spent fixing this problem, the better. I decided to test the circuit with some of the LED lights that I hadn't yet installed in the overhead areas do see if I was getting power through the solenoid. Sure enough I wasn't.
Now I spent an inordinate amount of time looking for a 35A breaker that someone had mentioned in another thread, and I could never find it. I had already looked at the 150A breaker, and it looked like it was closed, so I ignored it. After futzing around forever trying everything else, I decided it was worth a shot to reset the 150A breaker. I mean, what could it hurt?
And Bingo, tail lights, power mirrors and brake lights were back on.
Likely cause was a short from the AC circuit which I had removed the hardware for. Occasionally I bump my shoulder on the AC switches on the overhead panel. I need to remove the fuses for those circuits and disconnect the switches so that never happens again.
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