That's what I get for assssssuming you had an older system. That technical announcement is absurd. Every ECU on the planet acts exactly the same way. My 1995 Dodge Spirit, needs periodic battery de-sulfation? Yes it reaches 15.5 volts and slumps to as low as (observed) 13.2 volts on a ridiculously hot 122F day in Arizona.
Voltage Slump under load is normal for these harebrained systems. It drove forum member landyacht so nuts he bypassed the ECU and installed a Transpo F540XHD, adjustable voltage regulator. Me? I would be concerned if my system charged house batteries.
For STRICTLY vehicle battery use, the ECU "A Type" regulation is just fine. Never heard complaint alarms about short VEHICLE BATTERY life. For remote house batteries, I am quite certain you will find that as compared to a thermocouple compensation regulator (meaning the old fashioned kind), the ECU will deliver about 90% of the alternator product to the house batteries. Solar voltaics on the roof and a good regulator could help you top off the batteries in that case.
DIAGNOSTICS
Verify just how "Norman Bates" an ECU VR can get check on a GM technical bulletin for "Excessively Slow Voltage Recovery" if a hall effect amperage pickup is used. GM's idea on limp home is to minimize engine loading and this MAY mean a lowered default open loop regulator setting. MoPar systems are the same way.
"Periodic Battery Desulfation" Oh god, my side hurts. One bright side (the only bright side) is that aside from faults due to connection deterioration, ECU regulators are tough. Tougher than any integral voltage regulator.
BTW, I would not try to bypass your regulator. Newer systems use a Field Report FR, and bypassing anything will generate a permanent fault code in the computer.
And thank you for the correction! Now if I can only wipe the stupid grin off my face...Desulfation...Ouch my cramp!
