Name:   Shortbus - Subject:   Boat lift motor problem Date:   10/30/2016 8:51:03 PM (updated 10/30/2016 9:54:26 PM)

220 gives you twice the voltage but 4 times the power for the same size wire and amps.

I would check with the manufacturer and find the rated load for the lift.

Compare to boat weight.

Make sure the motor is the right size for that rating.

I see a big boat that will cause problems if anything is not perfect.

Too long a wire and/or too small a wire.  Check voltage while lifting.

Might need to be a 220 install for full load and very long wire.

Binding mechanicals needing grease possibly.

Sounds like your motor is under heavy load, losing RPM, and kicking back into start.

Hiss is the cap venting.  Time for a capacitor at least.  Don't run it until you do all above.

Don't leave it humming.  Shut off.

When the start kicks in and torque increases,  you have one second to shut it off with the new capacitor.

Is your boat full of water?