1988 Silverado Electrical - External Charging the Battery

[Heavy Cruiser]

Sits most of the time, 3500 w/Trailer Towing, so, every two weeks, measure battery voltage, Interstate MT-78DT, 2 yrs old, and generally, reads 12.1 volts. Quiesent drain is 25 milliamperes - ECM, radio presets, and clock.

 

Two chargers I have, Schaumbacher, less than one year old, and Black & Decker, six yrs old, connect to main battery and charge it.

 

The next time I go drive the truck, the ECM has been reset, as in back to Day One, all memory is lost, including radio presets. Previous battery charger before these two was a 30 yr old Schaum, hook up battery and plug in, select voltage and no issues later.

 

These new ones, especially the latest, has a microprocessor - for a battery charge?

 

You opinion?

Why the reset with the newer chargers? Everett

[ChevyTech77]

Gotta be missing something. No issues using the latest and greatest chargers out there on these trucks although not specifically these exact chargers, honestly.