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I typed out a whole post saying you didn't need that diode but I realised I'm wrong on that. When you shut the compressor off, or if the clutch gets stuck somehow, the electromagnet coil that operates the clutch could possibly turn into a generator since its a moving coil in a possible magnetic field. So you'd get voltage backfeeding the system possibly in a worst case scenario. So yeah you'll need to source a diode for that to be 100% safe.
The clutch could even get stuck on by generating a self reinforcing field kind of the way the alternator works without any magnets in it.
Last edited by fwayfarer; 03-25-2013 at 06:16 AM..
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