12V AC? - Page 2 - Fiberglass RV


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Old 06-24-2015, 02:31 PM   #15
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Originally Posted by Jay H View Post
I installed some LED light panels in my Boler and when I use shore power they strobe/ flash. I have the original Allanson converter in the Boler and I am pretty sure that I have it wired correctly. So, here is the part that confused me; when I used my volt meter to check the wiring it read that I was getting AC voltage (14?v) when I was running off of shore power. I thought the converter actually converted the AC to DC.
Any thoughts?
I have found that when a cooling fan in a converter fails, it often "pulses" the lights as it tries and fails to rotate.
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Old 06-24-2015, 04:15 PM   #16
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The battery is the filter for older poorly filtered battery chargers. If the battery is fully charged then it doesn't do much filtering.
Even good meters can under some circumstances read pulsating dc as ac. The ripple could be enough to read. A good Fluke meter will read the amount of ac ripple on top of the dc signal. Good for checking for ripple.
At what rate are they flickering?
It is possible you have an open filter capacitor in the power supply.
In this case you will get lots of ripple after the battery has charged.
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Old 06-24-2015, 04:35 PM   #17
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I think you need to connect it to a silly scope (Osilliscope) to see what it is. AC at 60cycles or pulsating DC.
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Old 06-24-2015, 04:41 PM   #18
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I had the same problem a new converter solved it totally , plus the old one hummed constantly and the new one does not make a sound .
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Old 06-24-2015, 08:27 PM   #19
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well, sounds like a new converter is on the list. That's a bit of a disappointment. It's definitely not going to happen before the end of summer, we have been working like mad to finish the Boler reno for a big trip to the Rockies, planning on leaving Saturday so no time to replace the converter before then.
I was planning on camping in non-electrical sites anyway. Use the solar to recharge the deepcycle if I stay more than a day or two.
Thanks for all the help.
Jay
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Old 06-24-2015, 08:34 PM   #20
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Originally Posted by redbarron55 View Post
The battery is the filter for older poorly filtered battery chargers. If the battery is fully charged then it doesn't do much filtering.
Even good meters can under some circumstances read pulsating dc as ac. The ripple could be enough to read. A good Fluke meter will read the amount of ac ripple on top of the dc signal. Good for checking for ripple.
At what rate are they flickering?
It is possible you have an open filter capacitor in the power supply.
In this case you will get lots of ripple after the battery has charged.
I am not really sure what rate they flicker at. It is a pretty fast rate, not enough for the ambient light to dim at all. I am really not well versed in electronics, so I have no idea how to tell if I have an open filter capacitor.

But, can you tell me, if the battery is partly discharged will the ripple disappear ?
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Old 06-24-2015, 08:44 PM   #21
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Charging the discharged battery may help.
Usually there is a big (sometimes blue) filter capacitor you can replace in the charger.
If the charger is for only batteries and not for sensitive electronics you might never notice the ripple. The LEDs react to the voltage very quickly whereas the filaments of a regular bulb do not.
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Old 06-24-2015, 10:33 PM   #22
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12AC?

Could be that the rectifier diode(s) or capacitor in the converter is bad. There is usually an unfiltered 12VDC and an unfiltered out put also.
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Old 07-28-2015, 08:13 PM   #23
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12VAC????
As my understanding, LED is actually a diode. i.e they are polarized and allow the electrical current to flow ONE WAY ONLY. Either these LEDs are ON or OFF if wrong polarized. That means your LEDs flickering are not a result of...12VAC, It could be FAULTY GROUND as someone suggested or ELSE. If I were you, I would have more closely inspection of circuitry in your trailer,,,Just a share...
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Old 12-01-2015, 08:14 AM   #24
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I don’t know if I would say to actually do this but... theoretically if you reverse the polarity of one of the led lights it should let you know if the converter is putting out 12vac. if it lights up and flashes like the others the diodes in the converter are probably bad, if it does nothing or burns out the pulse is not from the current alternating
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Old 12-01-2015, 09:34 AM   #25
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The really good LED lights have circuitry inside that allows them to be plugged in either way. Maybe a really cheep one from China will work.
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Old 12-02-2015, 01:52 AM   #26
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Flickering lights

The RV power converters/chargers I have seen only have half wave rectification. This in itself gives a very crude dc output. As one mentioned the battery is often used to smooth out the rippling DC. As another wrote a bad filter Capacitor will not smooth out the rippling DC. If the light circuit is directly at the converter the chance is greater for ripple in the dc line if the battery is what is used to smooth out the rippling DC. The further from the converter the less the ripple. The fact that the touch circuit does not work leads me to believe that AC is getting into the circuit. Incidentally I have never seen a DC touch lamp. If a single led glows no matter which way the the led is put to the circuit than it seems to me that there is AC on the line. If you must use something to charge your batteries use a car charger until you get the converter fixed
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Old 12-02-2015, 07:16 AM   #27
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Most I am familiar with are full wave bridge rectifiers or at least full wave. If you are seeing half cycle on a scope I would suggest an open diode.
Today many are better technology and lighter and more efficient.
Old converters could be anything, but I doubt single wave since the filters would be more expensive than the other diode. The tapped transformer more than the next two diodes as well.
When I posted I had a senior moment and forgot that the new technology is switching power supplies that do away with a lot of the weight and cost of the old time converters.
The Progressive Dynamics is most likely one of these since it is very light for the power output.



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Old 05-29-2016, 07:40 PM   #28
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original converter

Just before I was about to leave for a big cross country tour last summer I ran into voltage issues with my original Allanson Converter in my Boler. I posted that I was getting a strobing from my LED lights that I installed and that according to my measurements, I was getting 12v AC from the converter when I was expecting 12v DC.
A couple of weeks ago I pulled my converter and took it to a colleague who is an electrician. His report was identical to mine. It produces AC. In fact upon inspection of the interior of the converter there is a label that marks the 120 V AC input and another label that identifies the 12V AC output.
I guess that is the definitive answer to my question.
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