Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Light quit working 2 days ago. Tested all leads, no power to fixture from circuit board. Bulbs test OK

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The light is controlled by a relay on the circuit board. The problem is there are no schematics available and individual parts are not available.

Posted on Jun 24, 2009

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Frigidaire refridge has a double light fixture that stopped working. I have replaced both bulbs and checked the door switch


Ok, have you confirmed beyond a doubt that power is reaching the lite bulb receptacles? If so, then you need to get a hold of a schematic that will show you where it is possible for the power to be interrupted from getting to the bulbs.

If you have one of those refrigerators with control boards it is conceivable that the circuit goes through the board - if the latter is defective you are screwed.

On the attached link it may be possible for you to get the schematic for your unit. Check it out - it worked for me. Search Over 2 1 Million Appliance Parts

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My OS-2 Distortion pedal will not work. There is current flowing to the battery terminal, there is also contact noise in the output, but none in the input. The red light does not come on when powered and...


Common problem is a broken solder connection where power jack is attached to the circuit board. SOmetimes the circuit board is cracked or solder broken. If board is cracked, jumpers need to be soldlered on to bridge the crack.

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Side lights do not come on when you press the red switch


If this is a new installation, it may be that the battery just needs to be charged. Leave the power on for a while, then re-test.
If it is an existing exit light check the bulbs. If the bulbs are OK, the next suspect is the battery. Batteries Plus stores usually carry replacement batteries for various exit lights.
The only other culpret is the circuit board.
Usually the same make and model exit light are installed in the same building. Try swapping the suspect parts with known to be good bulbs and batteries from another fixture if you have one.

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O2 Dodge Dakota Brake lights wont work but bulbs r good.


If the bulbs are good I would suspect the Brake light switch.

Brake Light Switch: Testing and Inspection
The brake lamp switch can be tested with an ohmmeter. The ohmmeter is used to check continuity between the pin terminals.
Switch Circuit Identification
- Terminals 1 and 2: brake lamp circuit
- Terminals 3 and 4: RWAL/ABS module and Powertrain Control Module (PCM) circuit
- Terminals 5 and 6: speed control circuit
Switch Continuity Test
NOTE: Disconnect switch harness before testing switch continuity.
With switch plunger extended, attach test leads to pins 1 and 2. Replace switch if meter indicates no continuity.
With switch plunger retracted, attach test leads to pins 3 and 4. Replace switch if meter indicates no continuity.
With switch plunger retracted, attach test leads to pins 5 and 6. Replace switch if meter indicates no continuity.


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2 Answers

2004 Pontiac Montana Brake Lights, Pwr Window and Cruise all Quit


The same thing happened to my 2002 Montana minus the power window problem.

The brake lights and the cruise control are somehow tied in together.

I went to the scrapyard and ripped off a couple circuit boards from an old Lumina ($25 for the set) since there were no Montanas on site.

The problem seems to be when one brakelight goes the bulk of the current transfers to the other light and will blow it too.

Anyways you said you tried replacing the circuit boards and it did not work so sorry I could not be of more help.



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Check for headlight relay and fuse. Some cars have separate circuits for head light flasher and normal high/low beam. From your description, I would suspect a bad connection to/from relay or relay itself.

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1 Answer

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It would then be a bad ground. Start at the bulb fixtures cleaning and refastening; look for cracked broken wires as you go. A little multimeter will help.

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1 Answer

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For some reason, the bulbs I tested that worked somehow didn't work correctly when inserted into the door opener. We opened another set of bulbs we purchased and what do you know, the light now works. I don't fully understand as the other bulbs did work just not in the garage door opener.

Apr 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

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