I noticed that when my TT is plugged in, it no longer recharges the battery. This battery is less and a year old. Please excuse my electrical ignorance here, but I have a tool with two leads and a li...
Yes, your meter is set up properly, but you really should use a digital meter. A digital meter will show you the slight difference between 12.3V and 12.6 volts.
They are usually free at Harbor Freight. I have over a dozen of them, most still in the package. Seems every time I go into Harbor Freight they give me a meter! (Last night I went to buy another hitch hauler and they gave me a nice set of screw drivers)