Marine Electrical Systems USCG Question #510 (Set 17)

The motor fails to start on an attempted startup. With the start button depressed, a voltmeter reading between 1 and 5, as illustrated in figure "A", indicates line voltage available to the control circuit, what should be your next step in the troubleshooting process? EL-0007

USCG Exam Illustration EL-0007
USCG Examination Diagram: Illustration EL-0007
Official USCG Answer & Rule Citation

Correct Answer: Option D — attempt to reset the overload relay and determine the cause of the overload if applicable

Line voltage between points 1 and 5 confirms control circuit integrity up to the overload contacts. If the motor still fails to run, the thermal overload relay has likely tripped, requiring a reset and root-cause troubleshooting per IEEE 45 guidelines.

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