What would cause the a/c compressor in my 2010 Ford Explorer not to kick in?

Any suggestions on how to troubleshoot the compressor to make sure it's still good?

Low freon, use a wire and by-pass the low pressure cutoff switch, if compressor now works, recharge AC

It's a Ford

A bad compressor clutch relay, bad A/C clutch relay and a bad compressor grounds.

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