A technician tests a circuit that uses a ground-controlled relay to provide power to the circuit load. With the relay installed in its socket, the control terminal of the relay is grounded by a jumper wire; nothing happens. Technician A checks the coil input terminal for voltage. Technician B connects a jumper wire between battery negative and the output terminal of the relay to check if the load is the problem. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Technician A's approach is correct because checking the coil input terminal for voltage is a standard method to diagnose a relay issue. If there's no voltage, the relay won't activate. Technician B's method is incorrect because connecting a jumper wire from the battery negative to the output terminal of the relay does not properly test the relay or the load; it could potentially cause a short circuit or damage to the system.

A Technician Tests a Circuit That Uses a Ground-Controlled Relay