I'd still have it checked. I worked nine years in an IH parts department. Just because it's a new part, doesn't mean it's good. I've told this one before...we handled Delco Remy starters and alternators. On several occasions we would go thru stacks of each trying to find a good one, and that was 20 years ago. With all the off shore made parts, it happens more often than not. HAve you cleaned your grounds? IIRC you had your dash apart....how did the alternator gauge look? Wonder if a bad gauge could be the cause?