When the packs out of the frame make sure you add a grd wire between the pack housing and the chassis. Wont change your issue but it's a good practice. On the brighter side, most of these kind of problems turn out to be a simple fix, a bad electronic component or two. Twenty bucks and some solder and it's fixed. Problem is, it takes weeks to find the bad component(s)! Most folks don't have the patience or time and just replace the entire higher level assembly be it a new BCU, DCCP, etc.