3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
On the half ton its on the rear diff and its easy for the wire to corrode and get nasty. If you have 4 wheel abs then there is on both unit bearings in the front. Also the brake light switch could also cause it.
My 03 has 4 wheel ABS. Same thing happened with mine, ABS light comes on, the off, intermittantly, then stayed on. Checked all connections, etc during brake job, checked out ok. Turned out my pass side hub assbly/bearing bad.
Sounds like a warranty repair! Yeah, actually replacing mine today, they gotta make sure they place that ABS line in the clamps...pretty long and without it being clamped will flail all over the place.