Let's suppose the meter WAS connected properly......then what ?

Since this has a dc-dc converter, it's possible the output was pulsating, 
rather than smooth DC. In which case the meter might be attempting to 
measure peak or  RMS current.
In that case, the higher-than-expected reading might actually be correct. 
All kinds of weird things happen in switched circuits, that's why your 
oscilloscope will be the most important tool you have.

=====================================================================================================
BTW, I just discovered two back-to-back mistakes on my own that have had me 
running in circles for months now.

Two PCB sets (6-tube NIMO clock) . Both board sets "working", except 
board-set #1 was heating more than the other, and board-set #2 would 
randomly fail after several hours where the A/D converter "hung". and could 
not be reset despite all sorts of diagnose-and-repair software I had to 
write.

Board #1 had a damaged NMOS transistor in the HV section, and board #2 had 
a weak solder joint that eventually failed. I did all of the 
"shake/wiggle/jiggle" testing more than a year ago and never saw anything 
go wrong.


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