My 3.0L runs fine for about 2 hours then loses power and eventually stalls as if the alternator wasn't charging. Had it tested and it takes a load. Batteries are charged, but, after it stalls it is hard to crank, even causes solenoid to click, like low battery. I can't duplicate the problem in the driveway; when running, oil pressure at 40-45 PSI, engine temp at 145-175, alternator output voltage at 2500RPM at 14.5VDC (I checked it with a DVM across the + to - battery terminals). I suspected the outdrive for seized bearings because I found water in the oil but, when I took the O/D apart, I found no bearing or gear wear. I'm snookered.