Need Service Manual For Sears Craftsman Garage Door Opener 139.536006
I do not see a light switch on the control. There are only two 18 Ga wires going to the unit. However I will check the ground on the unit as I would almost bet the ground is not connected in the outlet as this is an old house when I go over to the place after work today.
Answer:
it was built by Chamberlain, if that helps you there website is here: http://www.chamberlain-diy.com/diy04/home/
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