[a2elvis]

Hmm, reading up on FICMs and found that weak batteries can be a factor, so I decided to focus some attention there.

A "cool" start at lunch after sitting 4 hours in 30-35 degree weather and I caught a glimpse of 10.6v during cranking after 12.3v koeo. Those both seem low to me. 14+ volts while idling, so I think the alt is ok. I guess I need to get them load tested.

Yep, have the batteries load tested and go from there.

In my opinion anything less than 47V would be a sign of a bad FICM Power Supply.