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Component identification
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Brumby:

--- Quote from: ArthurDent on September 14, 2018, 01:03:19 am ---Judging from the physical size of these modules there appears there is no way there could be a nearly 4 uF capacitor inside.

--- End quote ---
For the date code given - I would have to agree.


I just mapped out the measurements to see what, if any, sort of a pattern might become apparent.  The measurements marked with an asterisk are a copy of the value taken with the test leads reversed - ie. The value against 1 - 2* is a copy of the reading 2 - 1.  Likewise the value against 2 - 1* is a copy of the reading 1 - 2.



There certainly seems to be some symmetry across all measurement types - with the exception of the capacitance where there are two anomalies (green background).  The first could be a documentation error nF/uF ?  The second is the departure from the symmetry exhibited in the other measurement types.

What does this mean?  I can't say I have any idea, but I would be inclined to start trying some active circuit measurements.
bitwelder:
Have you tried to apply a (modest) voltage to a pair of pins and measure the voltages on the other two (and then repeat with another pair) ?
Brumby:

--- Quote from: bitwelder on September 15, 2018, 04:10:36 pm ---Have you tried to apply a (modest) voltage to a pair of pins and measure the voltages on the other two (and then repeat with another pair) ?

--- End quote ---

This is one example of an active circuit measurement.

One suggestion though: Use a current limiting series resistor when applying voltage.
ArthurDent:
There is another thread in 'Projects, Designs, and Technical Stuff' that might shed some light on what a possible problem here might be. Check 'SO.... What Capacitance are your Resistors...?'
Jwillis:
All components will exhibit ah inherent  resistance ,capacitance and inductance.Even rectifiers and capacitors.Also it will be difficult to clearly understand the measurements because its a closed circuit of 4 diodes.Meaning you get conflicting results because the measurement is taken from both directions of the circuit.Looking at the component I would have to agree with Benta that this is likely a rectifier.Likely a 600v 4amp.The 14 and 3.5 numbers looks like lot numbers with the date code below as someone else described .You can use a low voltage AC signal of no more than 6 volts to the 2 center pins and read the outer pins for a DC voltage . 
If it is a capacitor array then you should be able to read a slow voltage discharge from any two pins with a resistor in parallel and a DMM.
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