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04-22-2022, 07:55 PM
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#1
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Junior Member
Join Date: Mar 2017
Posts: 13
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Something running when hook to power.
We have a 2021 Rockwood 8337RL travel trailer and we are getting it ready for the season. I plugged it into outside power and something is running. It’s making a humming noise. The refer is off, the water pump is off, the heater is off, everything we can think of is turned off. It seems, though we aren’t sure, to be coming from the same area the water filter and fuses are located in the bathroom. I know this is very vague but any suggestions would be appreciated. We haven’t finished unwinterizing it yet and are concerned something that shouldn’t be is running.
Thanks!
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04-22-2022, 08:06 PM
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#2
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Senior Member
Join Date: Jun 2015
Location: Payson, AZ
Posts: 3,874
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converter fan?
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2015 cardinal model 3825fl
2015 dodge ram 3500 dually
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04-22-2022, 08:07 PM
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#3
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Senior Member
Join Date: Feb 2020
Location: Northern Foothils CA
Posts: 1,424
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2X Converter (cooler) fan?
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2021 2205S Rockwood Minilite
2019 F 150 Lariat 3.5 Eco Fx4 Max Tow
Equal-i-zer WDH, 1809 lb payload
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04-22-2022, 08:09 PM
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#4
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Site Team
Join Date: Oct 2014
Posts: 15,297
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The converter fan is temp controlled and will come on and vary speed based on the temp of the converter. If the battery is low or there is a heavy 12VDC load, the fan will come on and eventually go off when the load decreases.
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2015 Freedom Express 248RBS
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04-22-2022, 09:54 PM
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#5
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Senior Member
Join Date: Apr 2014
Location: Gainesville, FL
Posts: 4,555
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The converter fan can be confirmed by flipping off the breaker for the converter, I believe.
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TV: 2021 Ford F-150 4WD XLT Crew w/ 3.5L EB & HDPP, payload: 2,416#.
RV: 2020 Rockwood Mini-Lite 2507S, Propride 3P hitch w/ 1400# spring bars
Camping nights: 2021, 52; 2022, 99; 2023, 88; 2024, TBD (Est: 80+)
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04-23-2022, 07:13 AM
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#6
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Senior Member
Join Date: Mar 2014
Location: NY Capital District
Posts: 429
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Most converters are behind or below fuse panel. Is that where sound is coming from?
I do agree with others it is most likely the converter.
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04-23-2022, 08:50 AM
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#7
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Senior Member
Join Date: Feb 2014
Posts: 2,832
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Ditto...your converter is trying to charge your somewhat depleted battery and the fan is what you are hearing. Put a voltmeter on your battery terminals...and if you see 13.2V or greater your converter is running.
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Cam
2015 Georgetown 280DS
2019 Vespa Primavera 150's (pair)
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04-23-2022, 09:24 AM
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#8
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Junior Member
Join Date: Apr 2022
Posts: 2
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Could be your "Transfer Switch" humming or buzzing...not unusual.
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04-23-2022, 10:04 AM
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#9
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Site Team
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 21,578
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Quote:
Originally Posted by LennyOfPowhatan
Could be your "Transfer Switch" humming or buzzing...not unusual.
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Does a '2021 Rockwood 8337RL travel trailer' have a transfer switch?
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2015 FR Wildcat 295RSX / GMC Sierra
Nights Camped: '13 = 49/'14 = 74/'15 = 74/'16 = 85/'17 = 110/'18 = 111/'19 = 86/'20 =108/'21 = 115/'22 = 135/'23 = 78; Booked for 2024 = 69 |
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04-23-2022, 10:38 AM
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#10
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Junior Member
Join Date: Mar 2017
Posts: 13
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Quote:
Originally Posted by DustyRoads
Most converters are behind or below fuse panel. Is that where sound is coming from?
I do agree with others it is most likely the converter.
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Yes. That is where the sound is coming from. Can I test it by hooking my battery charger to the batteries and see if they show 13.2V or greater? We think the batteries were dead when the people moved the trailer to this new place. Will the converter shut off after it charges the batteries or am I still misunderstanding this.
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04-23-2022, 11:32 AM
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#11
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Senior Member
Join Date: Jun 2015
Location: Payson, AZ
Posts: 3,874
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it was mentioned above. to confirm that it is the converter fan go to your breaker panel and turn the breaker for the converter off. does the noise stop?
the fan is automatically controlled by the converter. there is no manual on/off switch for it. if the converter is running hot the fan will come on to cool it off. once the converter gets down to a lower temperature the fan will turn off.
the converter will run hot when it is trying to push max amps into a discharged battery. once the battery gets recharged the converter will not have to push as many amps and it will run cooler and the fan will go off. just get the batteries fully recharged and the issue will go away.
__________________
2015 cardinal model 3825fl
2015 dodge ram 3500 dually
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04-23-2022, 12:18 PM
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#12
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Junior Member
Join Date: Apr 2022
Posts: 2
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No generator on your model?...then no Automatic Transfer Switch. Sorry for the confusion. Goes to show, don't assume, eh?
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04-23-2022, 01:42 PM
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#13
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,835
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Quote:
Originally Posted by LennyOfPowhatan
No generator on your model?...then no Automatic Transfer Switch. Sorry for the confusion. Goes to show, don't assume, eh?
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As the OP stated, they have a Rockwood travel trailer. No travel trailers have built-in generators nor transfer switches. Only Toyhauler travel trailers have such things.
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and Zoe the Wonder Dog(R.I.P.) 
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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04-23-2022, 02:07 PM
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#14
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Senior Member
Join Date: Feb 2018
Location: TEXAS
Posts: 9,225
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Quote:
Originally Posted by Tunesmithnw
Yes. That is where the sound is coming from. Can I test it by hooking my battery charger to the batteries and see if they show 13.2V or greater? We think the batteries were dead when the people moved the trailer to this new place. Will the converter shut off after it charges the batteries or am I still misunderstanding this.
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It should shut off after charging the battery.
If you thing the batteries were dead, connect a battery charger to them when you're not plugged into shore power and see if they charge. You'll probably need new batteries. An auto parts store can test them to see if they'll recharge and hold a charge.
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2015 Dynamax REV 24TB class C
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04-23-2022, 03:00 PM
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#15
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Senior Member
Join Date: Apr 2014
Location: Gainesville, FL
Posts: 4,555
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Quote:
Originally Posted by Tunesmithnw
... We think the batteries were dead when the people moved the trailer to this new place. ...
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Regardless of where you plan to camp, do not tow your trailer with dead batteries. They're the source of power for emergency braking if the trailer becomes disconnected while towing.
__________________
TV: 2021 Ford F-150 4WD XLT Crew w/ 3.5L EB & HDPP, payload: 2,416#.
RV: 2020 Rockwood Mini-Lite 2507S, Propride 3P hitch w/ 1400# spring bars
Camping nights: 2021, 52; 2022, 99; 2023, 88; 2024, TBD (Est: 80+)
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04-28-2022, 07:14 PM
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#16
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Senior Member
Join Date: Aug 2016
Posts: 554
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If the battery was completely dead when you got it, I would replace the battery. Very few lead acid batteries will recover after being completely discharge.
The battery should be charging higher than 13.2 volts unless it is fully charged. A good, fully charged 12 volt battery should read around 13 volts at rest with no load. Depending on your converter, charge voltage may be as high as 14.5 volts and decrease as the battery comes up to full charge if you have a multistage converter.
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Western PA
2015 Silverado Z71
2018 toy hauler
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04-28-2022, 07:39 PM
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#17
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Senior Member
Join Date: Mar 2013
Posts: 340
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Quote:
Originally Posted by Tunesmithnw
We have a 2021 Rockwood 8337RL travel trailer and we are getting it ready for the season. I plugged it into outside power and something is running. It’s making a humming noise. The refer is off, the water pump is off, the heater is off, everything we can think of is turned off. It seems, though we aren’t sure, to be coming from the same area the water filter and fuses are located in the bathroom. I know this is very vague but any suggestions would be appreciated. We haven’t finished unwinterizing it yet and are concerned something that shouldn’t be is running.
Thanks!
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I would guess it’s the converter fan and/or inverter fan.
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04-29-2022, 07:49 AM
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#18
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Junior Member
Join Date: Sep 2019
Location: Southeast PA
Posts: 5
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Looks like you have a 1000 watt inverter, would be in a closet or storage compartment.
As others have said your converter fan would run as needed.
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ShoreThing
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04-29-2022, 07:07 PM
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#19
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New here, old elsewhere
Join Date: Feb 2021
Posts: 287
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Quote:
Originally Posted by bikendan
As the OP stated, they have a Rockwood travel trailer. No travel trailers have built-in generators nor transfer switches. Only Toyhauler travel trailers have such things.
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I had a 2005 and 2009 Trail-Bay TT with onboard generators.
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2021 Coachmen Apex Ultra Lite 253RLS
2016 Silverado 1500 Crew Cab Z71 / 6spd / 3.73
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05-02-2022, 06:46 PM
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#20
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Senior Member
Join Date: Oct 2015
Posts: 2,404
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Quote:
Originally Posted by gw1800
If the battery was completely dead when you got it, I would replace the battery. Very few lead acid batteries will recover after being completely discharge.
The battery should be charging higher than 13.2 volts unless it is fully charged. A good, fully charged 12 volt battery should read around 13 volts at rest with no load. Depending on your converter, charge voltage may be as high as 14.5 volts and decrease as the battery comes up to full charge if you have a multistage converter.
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Just to clarify for OP, a lead acid battery is considered fully charged at 12.6V or higher, reading after removed from charging for 30-60 minutes. Ours have never read 13V or higher except while charging. After charging gets out of the 14V+ charging stage, the voltage will read 13+ while still charging at a lower rate. Off charging, see attached charge.
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