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Old 02-10-2019, 03:13 PM   #1
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12DCV Fluctuations

Hi all,
A weeks ago I replaced a couple of LED lights in the kitchen area. Very bright white lights, a good change from the other LED yellowish lights that were there. Lo and behold, three days later, one of them went out. I opened up the reflector and surprise: it was blown to smithereens. Like 100 pieces of electronics. I took it back to the store (Camping World) and they refunded both LEDs, I figured it was a bad batch.

This weekend, I purchased some more and replaced 6 of them. Well, three of them blew this morning in the span of 5 minutes. Again broken into 100's of pieces.
For a little while I have suspected something is wrong with the 12V system: fans (kitchen, furnace, etc) along with the incendescent lights in the bath room fluctuate periodically, but not on a regular cycle. Today, after the LED incident, I took measurements on the DC supply. When the fans run faster, voltage reaches up to 17V, and "normal" speed shows voltage of 13.5V. The converter is from WFCO, model WF-8855.

From the WFCO web site I took a look at the trouble shooting flowchart, (https://wfcoelectronics.com/trouble-shooting-charts/) and seemingly the only serviceable parts are polarity fuses. Are converters known to go bad? It doesn't look too hard to replace, and Amazon has the exact same one for $145. Should I cut the chase and replace it right away?
Thanks,
Maurice
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Old 02-10-2019, 03:16 PM   #2
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I think I would..

It's not.difficult to.do.. I did mine last year after it stopped working altogether.
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Old 02-10-2019, 03:31 PM   #3
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Definitely sounds like a converter issue. On the WFCO website they have a trouble shooting guides. I would replace it with a more robust Progressive Dynamics unit from Best Converter. Contact the owner Randy and he will tell you what the best one is for your needs.

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Old 02-11-2019, 01:33 AM   #4
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Dump the WFCO and buy a Progressive Dynamics. The WFCO converters are junk. One of the first things I replaced. Sold mine on eBay for around $80.
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Old 02-11-2019, 05:45 AM   #5
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My guess would be a converter. But dont overlook the battery. Been in the automotive repair field for 40 yrs and you would be surprised some of the crazy problems I have seen caused by batteries.
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Old 02-11-2019, 12:46 PM   #6
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Time to put in a plug for a good battery monitor. My Victron BMV 702 (with USB Dongle making it a BMV 712) will record peak/min voltages in it's history.

I can open the app on my Smartphone and read maximum voltage since the last time I cleared the history. One of it's nice features besides monitoring battery state of charge and charging parameters (voltage/current).
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Old 02-11-2019, 07:35 PM   #7
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17V is excessive and will cause issues with most vehicle electronics. Most 12V electronics for vehicles - including LED driver circuits in RVs - can't take more than about 15V. Which is why the max output of the converter is limited (factory spec) to 14.4V.

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Old 02-11-2019, 07:39 PM   #8
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Quote:
Originally Posted by TitanMike View Post
Time to put in a plug for a good battery monitor. My Victron BMV 702 (with USB Dongle making it a BMV 712) will record peak/min voltages in it's history.
The BMV 712 replaced the 702. The 712 has a fraction of the power draw that the 702 has.
https://www.victronenergy.com/blog/2...tional-videos/
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Old 02-12-2019, 12:10 PM   #9
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Thanks everyone,


I just ordered a Boondocker 1260CL from Best Converter. It should arrive this Thursday. Randy told me it's plug and play. Will keep you posted.
Regards,
Maurice
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Old 02-12-2019, 12:21 PM   #10
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Excellent choice. Thanks for coming back and letting us know what you did.
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