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headlight questions

My 74 headlights make a grinding noise up and down so I took out the motor & gear assembly to clean/lube them. I wanted to test the motor so I hooked it up with jumper wires to a spare battery. The motor turned fairly well but it is still noisey. However, the jumper lead attached to the ground cable started smoking and all of the insulation melted. Is the motor bad or is a car battery too strong. I seemed to remember Jack saying that it was okay to test this way in an earlier post but I couldn't find it. I plan on getting a new motor and I would like to replace the 2 plastic gears associated with the emergency manual bypass knob. Does anyone know if the gears are available?
thanks and a Happy, Healthy & Safe New Year!!

Gary
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