Thanks for the reply. Here's what I found- got the unit apart, found the solder connection where the battery attaches to the mainboard, and measured voltages with the unit plugged in and on. 3 solder pads, from top (as in closer to the top of the iPod) measure as follows:
top-middle= changes depending on what is displayed on the screen.
top-bottom= 4.11 Volts.
Believing that the 4.11 is the charging voltage and the top-middle voltage is the regulated output to the mainboard.
Unplugged the unit and the 4.11V disappeared (duh) and the top-middle voltage went to 0 V.
Based on this, it appeared the batter was getting power to charge but not charging. I ordered a new battery and soldered it in (not for the weak of heart of shaky of hand) and this fixed the problem. Top-bottom now measures 3.81 V, which makes sense if the battery is charging now. I did not wait for the batter to charge to see what the V would be when fully charged. Hope this helps somebody else! thanks all!