I was having pulsation issues that caused lights to flicker, and recently some error codes showing excessive charging (remember we're talking the truck here...).
I added grounds, and had the alt checked but to no avail, so I finally got around to adding an external regulator. That solved the problem.
Now my question(s). The check engine light stays on, is that because the ECM is no longer connected to the alt? If so, can I run both the stock computer regulator AND the external together?
I like the check engine light for diagnostic purposes and would like to have it functional. But maybe I can't have my cake and eat it too?