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Old 04-27-2015, 08:17 PM   #1
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LED Works in Some Fixtures, only Partial in Others

I was taking part on another thread but didn't want to high jack the original OPs thread. Here's my problem. I purchased some wedge based LEDs to replace my web based bulbs. They were T10 68-SMD LED Bulbs - W5W 194 921 168. Altho they inserted hard in the fixtures (the oval part of the wedge on the LEDs is just a little larger), they worked fine in the bathroom vanity and the bedroom side lights. However, finally got several of them in the overhead lights, but only parts of the LED light up ... of the 68-SMDs only 8 will light up. Thinking the bulbs were bad, I removed those and inserted them in the bathroom vanity lights and all the 68+SMDs light up just fine. So took the working ones from the bathroom and inserted in several overhead lights and still only a part of the bulb lights. Does anyone know what causes this ... all the bathroom fixtures, the bedroom fixtures, and the overhead fixtures (about 8 dual overhead fixtures in the front and the back of the MH) all use the 921 wedge light. It almost appears the overheads don't have enough power to power the LEDs ... which isn't possible?
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Old 04-27-2015, 08:47 PM   #2
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My first thought would be low voltage in the sockets that won't completely light the bulbs. Get a voltmeter and measure to compare the good sockets with the bad ones.
I don't know your bulbs exactly, but the bulbs that many have used from the supplier in Calif. are made for more like 24V. I think the spec's are for something like 10 to 32 volts.
I put 2 led strips in the bathroom that each have 36 led's. at 12volts the lights are sort of ho-hum, but when connected to a 24 volt driver, they're knock your eyes out bright.
Check the voltage to see what you get. It could be a bad connection, like a ground, somewhere causing the voltage drop.
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Old 04-27-2015, 09:16 PM   #3
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Milehghcty
Try rotating the bulb 180 degrees. Some cheaper brand LEDs are polarity sensitive. Remove bulb from socket and turn 180 and reinsert, see if that helps if you haven't tried that already. I doubt that low voltage would be a problem esp if the incandescent bulbs you are replacing worked.
Cheers Rick T.
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Old 04-27-2015, 09:25 PM   #4
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Milehghcty
Try rotating the bulb 180 degrees. Some cheaper brand LEDs are polarity sensitive. Remove bulb from socket and turn 180 and reinsert, see if that helps if you haven't tried that already. I doubt that low voltage would be a problem esp if the incandescent bulbs you are replacing worked.
Cheers Rick T.
X2
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Old 04-27-2015, 09:35 PM   #5
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X2
X-3 I've had the same issue.
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Old 04-28-2015, 01:00 AM   #6
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Thanks all. The led bulbs I have will only work one way, so won't work at all if I rotate them. I will check the voltage but agree if the regular bulbs work then shouldn't be the problem. I may have to order some different brand led bulbs and give them a try. Lots of suggestions on leds on this forum with links.
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Old 04-28-2015, 06:23 AM   #7
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Ditto on polarity. On my new Entegra I found some lamps would work with LEDs and others would not. I used a digital voltmeter and determined the "hot" side was the outer contact and the ground was the inner. I rewired the lamp by switching the wires and it worked fine. I believe when they wire RVs they don't pay too much attention to which wire is the ground as long as the light comes on.
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Old 04-28-2015, 06:34 AM   #8
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Thanks all. The led bulbs I have will only work one way, so won't work at all if I rotate them. I will check the voltage but agree if the regular bulbs work then shouldn't be the problem. I may have to order some different brand led bulbs and give them a try. Lots of suggestions on leds on this forum with links.
If that is the case you will need to pull the fixture and reverse the wires on the socket. They could have wired the polarity on the fixture incorrectly.
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Old 04-28-2015, 08:43 AM   #9
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Are you on shore power or battery? Shouldn't make any diff, but... I have led's in almost all of mine. One fixture takes 5 of the 921 wedge bulbs. With incandescents this fixture was almost useless. With high quality led's it is fantastic when on shore power, but works poorly or not at all on battery power. I suspect having 5 bulbs in the fixture, it cannot pull enough voltage through the wires to fully light the bulbs w/o shore power/charger going.
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Old 04-28-2015, 07:19 PM   #10
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I'm thinking AFChap and Milehghcty both have low voltage problems. Incandescents will just get dimmer with lower voltage, LED's will go out when the voltage gets below the amount needed to excite the diode material. Check your wireing for a poor connection that is dropping the voltage.
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Old 04-28-2015, 07:26 PM   #11
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Is there a dimmer in the system? If so check to make sure it is at full brightness.

You can also check LED's with a 9v battery and a jump wire. Great way to check polarity of bulbs, connections when stringing lights, etc. Fits in you pocket and makes a great test source.
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Old 04-28-2015, 07:53 PM   #12
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Ditto on polarity. On my new Entegra I found some lamps would work with LEDs and others would not. I used a digital voltmeter and determined the "hot" side was the outer contact and the ground was the inner. I rewired the lamp by switching the wires and it worked fine. I believe when they wire RVs they don't pay too much attention to which wire is the ground as long as the light comes on.
Yep, incandescent lights don't care what the polarity is, LED's do unless they are made specifically to work that way. I found the '02 Dutch Star to be correctly wired everywhere I tried an LED. We'll see about the Magna when the bulbs get here I guess.
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Old 04-28-2015, 09:02 PM   #13
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The 921 wedge LED's I bought, Gold Stars on Amazon claim the will operate as low as 8V, haven't tried them that low. They worked fine for me, of course my solar was in float at 13.2V.
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Old 04-30-2015, 12:20 AM   #14
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Thanks all for the suggestions and help. I did get all of the little diodes on 68-smd LED bulbs to work today. It was caused by too much voltage drop as several suggested. The main light switch when you walk in the MH turns on 10 bulbs in 5 dual ceiling lights. if I go and manually turn off several (half) the lights, the LED will light as designed. If I plug in to shore power, I can have all the lights on and the LED will still light. Haven't taken a voltmeter reading yet, but must be real low when off shore power (strange as my interstate batteries are only a year old). So I'm thinking if I change all the bulbs to LED, I should be able to run most the fixtures at he same time. On my next LED purchase, I need to buy lower voltage bulbs. Thanks again.
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