94 skylark antilock brake light is on how do i check it out.

If I remember right 1994 was transition year from OBD1 to OBDII
Which one does your skylark have? Need to read the ABS codes if possible.
Here is a link to use Mike'* famous paperclip test procedure..
https://www.gmforum.com/obd-i-troubl...p-test-306836/
There we a few technical service bulletins regarding ABS light on for that car as well.
Mainly half way down etc under UPDATE section: Automotive Recalls and Technical Service Bulletins for 1994 Buick Skylark V6-191 3.1L VIN M SFI. Provided by ALLDATA

You need a scanner that is capable of reading ABS codes...