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It is only dropping a few hundredths of a volt.  Not a problem, and is expected.  Also, check the voltage at the switch.  If that isn't convenient; then check it where the switched voltage goes to the board and then key. What you are looking for is a volt or more drop in voltage.


Most guys use at least 12.5v to feed a radio with, but that shouldn't be much of a problem for testing purposes.


Another thing; if you make a video, the n be sure there is enough front light to see your meters and gauges move - JMHO.