Weird problem with Brake light and OBDII

[LittleBeast]

Check the horn fuse in the interior fuse panel, that supplies power to the obd port.

Also there is a rubber or plastic boot that isolates the positive post on the alternator from the housing (ground).

I will check but the horn is working perfectly.

I installed the alternator myself and everything is great under there.

How about your belt tensioner? If thats going you may not be getting quite enough out of your alternator. if you have a volt meter you can check the voltage at the battery yourself, when everything is off your battery should be around 12.6-12.8. When the engine is running you should be around 13.6-14.0. The battery light will also come on if you are over or over a normal voltage range. If you are under your abs light, and brake light will sometimes come on. If you are way over your check engine light will come on.

I have had problems with the belt tensioner in the past, but I am getting 13.8 consistently when running.

Ryan.....maybe a short in your computer?

Yeah that is what I was thinking, I just have no idea how/why or how to fix it :-(