The rear defogger grid is being tested. Technician A believes that the voltmeter should decrease its reading while probing a grid line as it gets close to the ground bus bar. Technician B believes that when the voltmeter reads 12 volts at both ends of the grid line, it means there’s an open in the grid line. Who is correct?
A. Technician A
B. Technician B
C. Both Technicians A and B
D. Neither Technician A nor B
Correct answer: A. Technician A
Explanation: You will want to check for a loose ground if the test light remains bright at both ends. If there is an open in the grid line, the test light won't get dimmer. It should remain the same brightness until it gets to the other side of the open. Then, it will go out.
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