east302
Full Access Member
I assume that the relay is hot with ignition on and that the VCM is supplying the ground when the a/c compressor is called to run. That would then close the contact allowing the compressor to run.
Or, that's how they run on the 95-99 models. There should be a diagram on the relay showing the primary and secondary/switch circuits. If the clutch engages when you jump the secondary, then I'd suspect a bad relay. But, there could be a short on the primary side instead.
Use a test light to jump the primary terminals and see if it lights when the a/c is turned on. If so, then I'd think it's the relay. If it doesn't, then check the power and ground circuits to see if there is a short. Test the primary terminal voltage feed to ground (test light from voltage terminal to a ground) and then the ground circuit (test light from ground terminal to battery positive).
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Or, that's how they run on the 95-99 models. There should be a diagram on the relay showing the primary and secondary/switch circuits. If the clutch engages when you jump the secondary, then I'd suspect a bad relay. But, there could be a short on the primary side instead.
Use a test light to jump the primary terminals and see if it lights when the a/c is turned on. If so, then I'd think it's the relay. If it doesn't, then check the power and ground circuits to see if there is a short. Test the primary terminal voltage feed to ground (test light from voltage terminal to a ground) and then the ground circuit (test light from ground terminal to battery positive).
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