How to Test Amp Draw With Multimeter for An A/C Compressor

Updated 04/03/2023 | Published 03/25/2023

Products Featured in This Question

Digital Multimeter with 42" Long Test Leads - LED Display

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$23.22

Question:

How do I test amp draw on compressor?

asked by: John

Expert Reply:

In order to check for amp draw on your Advent Air RV Air Conditioner System # ACM135C you'll need to set your multimeter # PT89ZR to the "amp" mode and connect your red clamp to a ground and then clamp your black lead to your compressor's common wire, which is shown as "C" in the attached wiring diagram.

With the multimeter connect, turn your unit on. Your compressor when running should be reading 9.9V, if it isn't reading that then you have a bad compressor and would need to replace it.

expert reply by: Bryce D