Nothing unusual about the jump. I used a Costco power bank jump starter.
Voltage at idle just now started at 12.2 and gradually decreased to 11.84 before I ended the test.

 

That would confirm a lack of charging at idle.

Rev and hold 2000 rpm for 30 seconds. Record battery voltage at the terminals.

 

12.17 volts at idle after reving to 2k rpm x30 sec

 

Sorry. I guess I should have been more explicit:

Rev to 2000 rpm for 30 seconds.
Record voltage
Return to idle.

You may need to mount the voltmeter such that you can see it while holding rpm @ 2000.

 

I'll get wifey to help in pm and get back to you. Thanks!

 

14.59 volts at 2k rpm after 30 sec.
I noticed as soon as I got home from work and put it in idle, all the dash lights dimmed. Got 44.4mpg after 25 mile fwy drive home.

 

14.59V establishes that the DC-DC converter is working in roughly the 1600-3500rpm range when the IMA motor is outputting an acceptable voltage. Above that, it's too high and below that, it's too low.

This tells me the IMA battery is isolated from the HV system.

You likely need professional code reading capabilities to get to the bottom.

Alternatively, you can DIY with:

https://99mpg.com/mikestips/readingtheblinkcod/
(to blink the codes, the codes on that page aren't for your car)

and get a 24 hour subscription to the manuals for $25 at:
https://techinfo.honda.com/rjanisis/logon.aspx

 

Cool. I'll give the blinks a try. Thanks again! Is it the same pins on the hch3 as on the Insight that need to be shorted?

 

Yes. It's the OBDII standard.

 

I just tried to get the blink codes and was able to get 85 and 56 before the 12v battery ran out of juice. I'm trickle charging it again.