When I'm opening the garage door, the light on the garage door opener doesn't come on. I have a sears/crafsman 1/2 HP garage door opener. I know that the light bulb is good, because when I disconnect the power to the opener by switching the fuse to off and than back to on position, the light flashes only once. Is there an adjustment switch to have the light on for 20/30/60/maybe 0 seconds on when the garage is opened? What else could be the problem?
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