Question

When testing the voltage drop on the positive side of the starter circuit (high current side), connect the red voltmeter lead to:

Select one:
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a. the input of the starter motor.
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b. the battery negative post.
c. the "S" terminal of the solenoid.
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d. the battery positive post.

Answer 1

D. The battery positive post.

For example, if your starter is engaging slowly when you crank it, to measure voltage drop in the positive battery cable hold the red probe lead on the positive battery post, hold the black probe lead on the post on the starter solenoid that the positive battery cable connects to, then have someone try to start the car while you watch the meter.