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Old 11-17-2021, 10:11 AM   #1
Papa
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Strange noise from converter

We have a WFCO-9865 converter in our 2011 Mountaineer that has started making a strange humming noise intermittently before the fan kicks on. Along with this we notice that our 12v lights will brighten and dim when the converter in providing power. The lights do not do this when running on the battery, just when the trailer is connected to shore power.

The humming/buzzing noise will come on 2-3 times and finally the fan will start. Am I looking at a failing converter?
 
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Old 11-17-2021, 03:04 PM   #2
firestation12
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Short answer....Maybe. You'll need to check the battery voltage with the shore power disconnected and again with the shore power restored. If the battery voltage is below 12 volts without shore power, that's one issue. Whatever voltage you find with the shore power connected and the circuit breaker to the converter in the on position, may point you to another problem. You'll need to supply some readings (as described above) to get the proper advice from the resident sages on this forum.
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Old 11-26-2021, 03:53 PM   #3
Papa
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noisy power converter

Firestation12, thanks for the input, I currently don't have the trailer where I can easily work on it. I am thinking about removing the converter and bench checking it for function. I will post back after the holidays with any information I find.
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Old 11-27-2021, 08:29 AM   #4
ChuckS
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With the age of the OEM WFCO Id be looking at a Progressive Dynamics with charge wizard as my replacement converter... a much much better unit then the OEM
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Old 11-27-2021, 03:32 PM   #5
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That's where I am leaning, electronics wear out just like anything else. People tend to wait until complete failure before replacing electronics. I worked in Network Systems maintenance and fully believe in "End of Life" use for just about any item with electronic pieces or moving parts rather than "wait until it breaks" maintenance.

I'm not familiar with PD products or multiple battery RV setups. Do you have to have a specific converter/inverter for use with series wired (multiple 6 volt) or parallel wired (multiple 12 volt) battery systems?
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Old 11-28-2021, 09:06 AM   #6
ChuckS
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I have been running two GC2 batteries for 8 years.. This link will give you some insight into PDs product line... The 60 or 70 amp converter would be a fine replacement for your OEM WFCO and is a FOUR stage converter..

https://www.progressivedyn.com/pd9200-converter/
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Old 12-01-2021, 02:28 PM   #7
bcrvman
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Quote:
Originally Posted by Papa View Post
We have a WFCO-9865 converter in our 2011 Mountaineer that has started making a strange humming noise intermittently before the fan kicks on. Along with this we notice that our 12v lights will brighten and dim when the converter in providing power. The lights do not do this when running on the battery, just when the trailer is connected to shore power.

The humming/buzzing noise will come on 2-3 times and finally the fan will start. Am I looking at a failing converter?
Unless there are other symptoms to indicate a problem, it's likely just a transformer that has some loose laminations. It shouldn't happen, but isn't dangerous, just annoying. If it bothers you too much, a new better converter is not expensive.
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