More battery/voltage help needed

[Scott Forman]

OK guys...I need more help.

My coach now has four brand new T105 batteries. With my engine
running at "high idle" (about 1200 rpm), a multi-meter reading at the
alternator reads 13.6. This is also the voltage shown at the
batteries with the engine running and at the voltage gauge.

Is this normal? Before I installed the new batteries, the voltage
gauge usually registered above 14 when running. Is this because the
new batteries are new and require less output?

I am asking all this because it seems like these new batteries are
not as strong as the old ones "at rest", leading me to wonder if they
are not being charged enough while the engine is running.

Thanks,
Scott Forman
82 FC35RB
Memphis