Had an issue over the weekend where my nb started putting out 17.8 volts which took me too long to realize. Alternator died shortly after and battery was unhappy.


decided to swap to an NA alternator with internal regulation. Wired grey/red to switched 12v and grey to brown/red.

New alternator is steady charging at 14.4 ever since and doesn’t seem to be turning off. Battery voltage with car off is usually around like 13.5 and slowly falls to 13.0ish. Confirmed at grey/red pin that I am receiving voltage when running, though it seems to be 14.2 when mega squirt is reading 14.4.

what gives

 

welcome to dumb regulation. That all sounds normal.

Voltage error on MS is just tolerance stack. +-%5 accurate part here, +-5% part there, wiring losses, and battv correction table - that's all expected. Tune it if you want.

 

totally fine with it if the numbers are normal