A/C guy here. You will need a meter that can check microfarads to test the capacitor accurately. Since you have another unit why not check if the other unit has the same capacitor ( the capacitor has a mfd rating stamped on it, if they both are the same it is ok to swap them). It could just be a bad capacitor, or the compressor could be seized.
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2019 F350 DRW Crew Cab 4x4, 2018 Montana 3820fk, 300 watts solar, 3000 watt true sine inverter.
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