1998 Blazer 4door 4x4

When I am close to stopping, my trucks abs feels like it kicks on and I lose stopping distance. My engine light and my ABS lights are not on. I did a little research on the forum and someone had a similar problem with a '04 silverado and they told him to check the ground for the abs module which was located on the frame beneath the drivers seat.

I was thrilled since i just replaced my fuel filter and fuel pump (what a nightmare) so i figured just a ground was off but...

I looked and i could not see any ground wires on the frame. Anyone know where this ground would be??

Thanks a mil

Mike