The blower motor does not run in any fan switch position. A check with a DMM reveals that power is getting to the motor. Technician A says the motor ground is bad. Technician B says the motor is burned out. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Both Technician A and Technician B could be correct. If power is getting to the motor but it's not running, a bad ground could prevent the circuit from completing, which is what Technician A suggests. On the other hand, if the motor itself is burned out as Technician B suggests, it wouldn't run even if power is supplied and the ground is good.

The Blower Motor Does Not Run in Any Fan Switch