Can anyone tell me what voltage the charging system should maintain if all is well? Last Saturday I checked the system, had 12.1-12.4 volts while running - engine speed didn't seem to have an effect. It was sluggish to start, I knew the battery was a few years old so I replaced it with a 14amp/hr unit. Later I checked it again, it was 11.8-12.1 while running. I shut it off, scratched my head, started it up and now it's charging 13.5 @ idle while the cooling fan is running, 13.9-14.1 when the fan is off. These numbers were all at idle speed.
I'm liking what I'm seeing now, but confused as to why the system was in the 11-12 range eariler. I didn't do anything, I promise!