I have a home built chicken plucker I built last year. It has a 3/4 hp farm rated thermo overload motor on it. It had plenty of power before but last week we were offing 16 birds and only got to 10 because the motor on the plucker bogged down. It got so bad I had to spin the plucker plate to get it moving and I finally gave up. Nothing is blocking anything or hitting anything. I have a heavy 12 gauge wire plug hooked up to a short 12 gauge extension cord. Where to start looking?