With no air in the tank and amp meter connected to one leg of line, start compressor and note amp draw thru cycle. It should draw low amps at first then reach rated amp draw close to end of cycle(most likely 12-15 amps). If amp draw is normal then replace thermal breaker. Older compressors have thermal breaker incorporated within winding and may not be easily replaced (but not impossible). If amp draw is higher than rated, check capacitor for proper rating and make sure that the in-tank check valve is not leaking pressure back to pump. Good holidays
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