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Could be the capacitor.
The start capacitor typically is round and the run capacitor is oval in shape although there are some out there that have both in the same housing.
There could also be a start relay that brings the start capacitor in at startup and cuts it out when the unit is running.
As mentioned before, make sure the contactor is closing all the way. No critters inside.
If you have a multi meter, disconnect power from the unit and remove the terminals from the compressor motor terminal board.
Check ohm values between Start, Run and Common terminals.
Check for a breakdown in resistance between any of those bare terminals and Ground (copper pipe or bare metal on compressor)
Check the condition of all the wiring connections (burnt/hot looking).
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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