I've got a 10 year old Amana refrigerator with the freezer on top.
The original icemaker stopped working.

I have replaced the icemaker and the automatic valve (I have good
water pressure) and the unit(s) do not work.

I've since seen a good bit about testing/replacing the icemaker and
valve. Putting the test jumper does not cause the unit to operate. I
have approximately 50 volts at the connector and right at 120 volts at
the refrigerator outlet. The voltage is also low at the test points
on the icemaker itself. I read somewhere things are OK as low as 80
volts although even that voltage seems low to me and hard to explain.
The refrigerator/freezer/lights operate normally except for the
icemaker.

Based on the simple schematic on the back of the refrigerator I see no
reason for the voltage difference but then it is a simple schematic.
There was ice in the tube that feeds the icemaker so it's
possible/likely the harness got wet but I have used a hair dryer on it
a few times now. I can't really get to the whole harness without
breaking what looks like a seal I should not mess with(unless someone
can tell me how) for a good visual inspection.

I do not have a good feeling about any potential repair people
(including Amana/Maytag) my wife or I have spoken to about the unit
because they keep asking about the all the common stuff I've already
checked. Ideas?