2nd Gen Non-Engine/Transmission ABS light intermittent

[PetesonM]

Truck while in park at idle will random flash the ABS light for a moment. Any thoughts? Could there be a short maybe causing the tc lock unlock issue as well? I have done all the fixes for the tc problem and most seem to make the problem go away for awhile then the prob returns. Its been years now and the mystery switch is cool it keeps people from using my truck, but it's getting a little old.

 

[Bob4x4]

Did you ck for abs codes?