Power interruption error code 5A

[workingonit]

Originally Posted by andrewwynn

... I've never seen a working alternator drop below 13v at any RPM.

Then you've never had a 10DN alternator (GM) with an external regulator. When I first got my old 327 Chevelle, it had that alternator, and when idling at 600-700 in drive, the battery would drain to under 12.5vdc consistently.

I would put it in neutral and rev it 'til the alternator would kick in, but that was my temporary solution. I moved up to a 105 amp one wire alternator, which worked fine until I got serious about drag-racing, went to a big-block 427, and used a 140 amp alternator (with deep-groove pulleys).

But, after continually throwing belts at 7200+ rpm (and disintegrating a rod at 7400 rpm when the limiter failed), I switched to a bigger/badder 427 with dual batteries and charging between rounds. No more alternator problems. P.S. that 14:1 compression BBC would rev all day to 7200, and still lives after 100's (1,000's?) of rounds (but now traded for my X5). Sniff!