Boonhauler,
I did look at your build after my post. Nice build by the way! I know about being extremely anal as I was too about my discrepence in readings. Something was wrong and I couldn't rest until I found it. It did give me an excuse to buy a couple of nice pieces of gear though, one being the clamp-on DC ammeter and the other being the Rogue charge controller.
When I said "error on someones part", I wasn't actually thinking you, I was thinking either the trimetric or the Magnum's display. I should have been more clear.
I was certain mine was correct. Having worked as an electronic/electrical technician for over 35 years, I figured installing the trimetric would be a piece of cake and it was. I did know about the generator ground cable on the battery and I was thinking, well, I'll miss the measuring the start up current of the generator, falsly thinking there would only be current flow in that cable when the starter was engaged, totally neglecting the little fact that the generator was frame grounded. Oh well, as you said, none of us are perfect.
If my post didn't help you, perhaps it will help others. I already know of a couple of others on another forum that were helped my me sharing my mistake.