Seth20

My car recently died while traveling very slowly in traffic. Had no juice. Just like the alternator died and it ran out of battery. No power. Jump started it and drove it home. Put a Subaru Reman alt on in, then it died again. Never had a warning light. Put a new battery in it. It now runs, but runs rough, and ABS comes on and off sporadically and power steering is on and off as I tried to turn. Any ideas what else electronically could be causing this? Thanks!