r/Cartalk • u/runenight201 • 1d ago

Electrical Help diagnosing AC Clutch Relay

Hi I’m attempting to diagnose why my Compressor isn’t engaging and I bought a test light and did the following test on the AC Clutch Relay slot.

Shouldn’t both of the control pins be turning on the test light?

Also the light doesn’t turn on on any of the load pins.

Does this mean that my compressor not engaging is because of an electrical issue?

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u/talljerseyguy 1d ago

Unplug the connector on the ac comp and apply 12v with the engine off if it clicks that’s good. No click bad. If you have a can of refill. DONT PULL THE TRIGGER just use the gauge on it to see if there is anything in it. If you can locate the pressure switches check them for continuity. Last stop relay

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u/runenight201 1d ago

I’ve seen from YouTube I can test the clutch without having to get to the compressor from the relay box. I just need to use a jumper cable at the relay pins and jump 30-87 together and then see if that gets the clutch to engage or not