> So is 14.02 at the alternator good?  Is that voltage drop between there
> and the starter battery near acceptable?   Am I on the right track, thinking
> my older aux battery is needing replacement?  Worthwhile swapping in a new
> voltage regulator and putting the present one into my spares box?

You need a new aux battery.  When you take out your current (pun)
dead one, then check the voltages at the alt and the starting battery.
Then with the new aux battery, check again.  Then you can tell
if your voltage regulator is working well or not.

Richard