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Old 06-24-2014, 05:46 AM   #1
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One Lonely Halogen Pain

2011 3455SA Hickory - ODS slide (TV & Fireplace)- only halogen light in the coach is centered in front of the cabinet (not very useful). It will not light. Bulb is good - wire tested directly from battery. Switch is good - continuity meter test on/off. Voltage is nominal 12.5VDC at the fixture's terminals on shore power. Fixture is locked into place - I cannot determine by what means and cannot pull it out beyond an inch. Worked well from new through this past Spring. Just noted during work on TV this past week. Any ideas?

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Old 06-24-2014, 06:27 AM   #2
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I would think it's a bad connection somewhere. Most likely the switch. Sometimes a connection will flow electricity as long as there is a minute(sp/tiny) current draw (volt meter), but when a larger current draw (halogen bulb) is applied it won't allow enough current flow through a connection.

There are several ways to test for this situation, some safer than others. My first choice (right or wrong) would be to place a jumper wire across the switch wire connections, eliminating the switch from the circut. If that does'nt work I'd move along to the fixture and eliminate the wire and bulb conections one at a time. Not sure where the ground connection is for that slide, but that's a place I'd check out also. A loose connection there could cause the same effect.
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Old 06-24-2014, 08:17 AM   #3
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Never thunk o' dat. I'll try it and put the meter at the fixture. The wiring here is "lamp wire" type - don't know if the ground side goes all the way back to the converter. There are no exposed wires on this chassis and no junction boxes under the slides or the rest of the coach; more to the point, I haven't found any. Still can't figure out how to remove the fixture so I can get to the terminals.

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Old 06-25-2014, 06:17 AM   #4
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If you can see anywhere near the top of the fixture can when you pull it down that you see a metal wire on each side opposite each other? Most of these fixtures are held in place by "spring wires" on each side or ears if you want to think of it that way. It could be that the fixture was twisted in circles during installation and that is "shortening" the wires leading to it and preventing you from pulling it down any further. Don't know what your fixture looks like, but when you say that voltage is 12.5vdc at the fixtures terminals...was this at the bulb contacts or what? I would expect to see 12vdc at one side of the bulb and ground at the other side...which would allow the bulb to light. If you measure 12vdc on both sides, then you don't have a ground connection. Ground should come into the fixture and go to one side of the bulb, while the other lead into the fixture should be 12vdc that goes to a switch, If it has one on the fixture) and then onto the bulb. Just some suggestions for you. Good Luck. John
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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Old 06-26-2014, 05:12 AM   #5
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The "lamp wire" is separated and one side is interrupted by the switch. This leads me to believe that we are dealing with +/- legs. I took pieces of a small paper clip and inserted one in each of the pin hole that receives the bulb. Got 12VDC switch on and zip switch off. So that confirms continuity and current. Thanks for your info; I will now test the fixture once I follow your instructions and remove it from the ceiling.

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Old 08-23-2015, 10:58 AM   #6
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I'm really slow with the mail. In the end, it was a defective internal terminal so I got a new fixture and screwed it in place. I would no have found that out without the forums help. Thanks.

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Old 08-23-2015, 12:59 PM   #7
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M.O.C. #12947
Those halogen bulbs get really hot, a reason why the contacts failed. There are LED bulbs that will replace the halogen bulb and save you the hassle of dealing with this problem in the future.
Bob & Becky
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Old 08-23-2015, 03:49 PM   #8
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I agree with Bob! I'd be replacing that halogen with an LED that matches up with that specific bulb #. They are expensive but they are worth every penny. If they weren't worth it Keystone would not be putting the LEDs in their units since about 2013 if not before. They also save power for you especially if you pay for your electricity at a park.
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