Door Buzzer Goes Off When I Touch the Brake Pedal

[1985 Bronco]

I just replaced the brake booster, reinstalled the brake light switch, and now the door buzzer is acting weird.

With the key on or off, and with the door open, when I press the brake pedal, the buzzer makes a noise. It seems quieter than it should be.

Also, the door buzzer does nothing when I have the key on, and door open.

Any ideas? I don't see any wires pinched anywhere. I don't think it's supposed to be connected to the brake pedal?

It does not make a noise when the door is shut and I touch the pedal.

[ArdWrknTrk]

This is a 1986 F250 with a Cummins swap?

[1985 Bronco]

Yes. Someone else did the swap and monkeyed with the wiring a little, but I've mostly removed all of their sins and the harness is pretty much the stock one now. When I bought the truck they had solid core house wiring hooked up to LED lights and I've found a bunch of "splices" where they just twisted wires together and wrapped them in tape.

But, it stopped making the buzzing noise right after I posted this thread, so I'm not sure what to do.