alternator on '77 300D - not charging battery - or battery prob?

It appears that the alternator on my '77 300D is not charging the battery anymore, or the battery is not charging via the alternator. I took my alternator up the other day to Schucks, they tested it and said it was fine. After driving a while, the battery-dependent electronics show that the battery is dying. Last night while my 300D was running, I disconnected the battery leads from the battery and hooked my multi-meter up to the neg and pos wire connections (not on the battery). The voltage was in the range of 10.xx to 11.xx volts. Now I'm no mechanic, but shouldn't it be higher?

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