Just a simple question...What is the saf range for battery output? I'm probably not wording it very well, but for example, my head unit displays current usage, and it's steady around 13.5-13.7 volts. I'm sure it's not completely accurate, but it just made me wonder what is average. Anyone know?

 

anything above 12 is good .

 

For the most part, anything about 12 is good. Anything above 15 is BAD, though, and is a symptom of a bad charge regulator in the alternator.

Normal battery levels:

Engine off - ~12.5v
Engine running, lots of accessories running - 13-14v
Engine running, no accessories running - ~14.5

 

awesome...greatly appreciate the input