Is there any sort of voltage safety shutdown/reset that would cause the dash to light like a Christmas tree and then reset and come back up? Also, the more annoying part is that ps seems to do the same.

This started around the time I lost my alternator (and then went thru 3 shitty auto parts store rebuilds to get one that works). I think I was getting too much voltage out of the second alternator as it would rev up. I think it hit 16.7v or something according to my scanner. I can’t remember. Either way, it seems like the dash/power steering, etc would all reset when I hit like 4K on the tach. It’s been fine after I swapped the alternator and I thought it went away, but I’ve had the same issue pop up the past couple of days, but now it only seems to pop up over 5k. I’ll go read the codes and see if it popped anything, but it didn’t last time. I didn’t think of it until now because My car usually has the cel lit due to the high flow cat and full exhaust the po installed.

Ok, I checked the codes. I had some downstream o2 sensor nonsense, which I always have, but it did throw speed sensor a as well. I reset them and tried Monitoring the voltage as I rev the engine. The max I got thru the scanner was 16.5, and it was cutting out/Christmas treeing consistently about 5500 rpm. Any ideas?

Your alternator put out 16.5V? Wow that’s way too high.