I am having issues with my 1997 B2500 Van with 5.2 that I cannot seem to figure out what's happening. Starting first thing the van runs fine, I show the voltage is good and no problems but once the van has ran for a while (100 miles of travel or more) it stops charging the battery and eventually lose all charge. I slowely start seeing the voltage drop late in the trip (unfortunately when I'm away from home) and if I'm lucky and it's not getting dark I can make it back otherwise the headlights will kill it quickly and I end up stranded. I replaced the alternator but still seeing the exact same behavior with the new one. Any help would be greatly appreciated. It's my only vehicle so I can't afford to have this keep happening but also unemployed so cannot afford to have a professional repair.