I would not call 3 uf large.You need to do a sequence of measurements to measure ( test ) a large capacitor.
To save me typing look HERE
You should get a resistance between U1 andU2 run winding
and U1 and Z2 start winding
Touch probes together to check ok 0 ohms
Test between U1 and U2 Reverse probes and recheck..... Repeat with U1 and Z2.
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