Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
Check the output voltage to the battery charge rectifier. It should be around 18 to 30Vac. Anything lower the windings behind the flywheel are shot. If voltage is present, then the battery charge rectifier is shot.
Posted on May 12, 2009
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Posted on Jan 02, 2017
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