Occasional starting difficulty with Digital HP CD box in my D200

I was planning to have the battery load tested but I went out today after the truck had been sitting a couple days and the voltage was at 12.6 at the terminals. Then while cranking over the voltage at the battery terminals only dropped to 11.3 which is 2.5 more than the ignition box needs at the ON signal wire. I'm going to start looking in the dash for wiring issues, clearly there's something going on if the voltage is only 9 during cranking in the ignition RUN circuit but over 11 at the battery itself.

I've had batteries go bad before and you can tell by how the starter cranks slower. Last one in my Duster got low enough that it wouldn't trigger the Mallory CD box to turn on and it was obvious because the starter cranked much slower than normal.