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The MEP-803A can be set to output one of three different Phase/Voltage settings.
1) 120 volt
2) 120/240 volt Single Phase
3) 120/208 3 Phase
The output specs for the MEP-803A.
The first voltage is the phase to neutral voltage. The second voltage, if listed, is the phase to phase voltage(s)...
It could be one of the resistors has failed open. I'd suggest disconnecting the two wires to CT3 and then measure the resistance between the two removed wires. It ought to be 3.75 ohms. The resistance of R12 & R13 7.5ohm resistors in parallel. If you get about 7.5 ohms then I'd suspect one...
You indicated you had 9.5 v across R12. What's the voltage across R13?
When set to 120/240 the switch connects R12 and R13 in parallel. My hunch is they are not getting connected in parallel resulting in about 2x the voltage.
The only relay in the row that has anything to dowith the contactor operation is K20 the rightmost one. It provides 24 volts for the contactor control circuit.
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