I wanted to post this once i got it figured out because i searched and didnt find anything exactly like it.
on my 98 bonneville sse,
Ive been having an issue with the headlight/brake monitor for a while where the headlight monitor will randomly turn on and off and sometimes if you hit the brakes the headlight one will turn off and the brake monitor light will come on. i tried cleaning and checking all the sockets, all the bulbs work. finally i checked out the infamous driver side ground that gets corroded and this is what i found;
the main ground was corroded and heating up the wire, so i soldered them all together. i also cleaned the grounds two behind the pcm and one behind the battery but i think the bus was the issue
1998 Bonneville SSE
2007 Monte Carlo LT-KYB, Clarion, Polk audio, Kicker
1999 Yukon SLE-KYB, Air lift, Reese dual-cam, Tekonsha
1987 Firebird-355/th400-nothing stock