Jeff:
I updated my previous post with the picture you requested.
Note that when I connect the positive lead to common I get 21K, and when I connect the negative lead to common I get 40K
Also, I went to the back and tested VC to ground on both of the relay cards. one of them shows resistance, the other is shorted, is that normal?
Note in the picture the HiZ switch is in the 24 position, but it doesnt matter, the switch that makes the difference is the DOA switch. 24v position everything looks fine, 16 V position and I get the higher resistance.
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I should also say that when it shows these resistances (V+ to C) they don't show right away, they slowly rise, like there is a capacitor charging somewhere. But they stop for over a minute at 40K.