How Does the electronic control module in a car ECM Control the Alternator

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[@nickpeezy1443]

If you change the OEM alternator for a high output alternator, with a large battery bank, is there a setpoint voltage within the ECM that will limit output, since it's original designed is for one battery and less amperage?🤔

[@AutoVFix]

Upgrading to a high-output alternator and adding more batteries will only sometimes overload your car's Engine Control Module (ECM). It usually adjusts to manage the charge rate rather than limit output. However, your ECM might need reprogramming for optimal performance with the new setup. Don't forget that your car's electrical system-wiring, fuses-needs to handle this increased power load. It's best to check with your mechanic before making such significant changes,

[@knockout_wj8886]

When my headlights are off, my voltage goes from 14.2v up to 15.2v after about 3-4 minutes of the headlights being off. Turn them back on it drops to 14.2v. Also sometimes after it's been sitting for at least 12 hours it will not charge at all. I can disconnect the battery and hook it back 20 seconds later, and it works fine. All new wiring, current sensor, alternator, and battery. 2010 Cadillac Escalade. Only thing I haven't replaced is the PCM. Would PCM/ECU cause the alternator to have intermittent charging issues, and highly voltage output while headlights are off? Please help 🙏.

[@dannypalmer7701]

Didnt explain the exciter wire on alternator or also the Alternator battery trouble light.😮

[@myviews469]

On my 2011 Town and Country I dont believe my voltage regulator is on my alternator i think its in the ECU ECM is this true?