This test will prove the voltage is adequately coming into and going from the contactor. If the proper line voltage is entering the contactor, but is not exiting, the contactor is bad or the contactor wiring is incorrect. If incoming line voltage is adequate coming in and leaving the contactor, the contactor wiring is accurate, and the high voltage side of the contactor is doing its job correctly. This article is meant to be used as a training aid to understand how to read the high voltage side of the contactor, and ensure line voltage is coming in and out correctly when we hold the plunger. Step 1.

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