Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > 5th Wheel Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 07-20-2016, 08:35 PM   #1
Member
 
Join Date: Feb 2016
Posts: 36
Buzzing Noise from Transfer Box

There is a humming/ buzzing sound coming from the transfer switch.The unit is prepped for a generator, but one is not installed.It has been making this noise for at least a couple of months.I have pulled the cover on the switch box and everything "looks" ok. The box is not hot to the touch and no smells like wiring is getting too hot.This is on a winnebago 5th wheel using 50 amp service.Everything electrical works fine on the trailer.The sound can't be heard inside the unit, only when accessing the basement area.
I thought I would run this by the folks on here before calling the dealer tomorrow.
__________________

__________________
porchdog2 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-20-2016, 08:41 PM   #2
Senior Member
 
Spk64's Avatar


 
Join Date: Apr 2014
Location: Floyds Knobs, In.
Posts: 1,026
With power removed I would check all the wire connections. They can work loose and humming will increase.
I had a loose neutral and the humming was much better after tightening.
Also depending on which type of coils (AC vs DC) are in the relays will impact the amount of noise.


Steve
__________________

__________________
Steve
2002 Newmar Mountain Aire 4095
Spk64 is online now   Reply With Quote
Old 07-20-2016, 08:43 PM   #3
Senior Member
 
Join Date: Nov 2005
Posts: 3,258
Lots of info on this subject on the forum--basically, its a design issue. For most x-fer boxes, the default is genset, even if one is not installed, so the box has to switch to shorepower when plugged in. Many boxes are also designed to use AC current to actuate the contactors, vs DC current--thus more hum from the "alternating" current. Finally, as these boxes wear--they tend to hum more.
PS--good maintenance item is to, on a routine basis, loosen and retighten the lugs inside the box [with the power off, of course]
__________________
Old Scout
2003 40' MDTS
Garden Ridge, Texas
Old Scout is online now   Reply With Quote
Old 07-20-2016, 09:00 PM   #4
Registered User
 
Join Date: Jan 2009
Location: The Great American Southwest
Posts: 298
It could be stating to fail because of bad coils, now might be a good time to buy a replacement to have on hand.

How is your fire insurance? Electrical problems don't have a history of getting better with age.

You know the old saying: Pay me now, or pay me more latter.
__________________
Happy Prospector is offline   Reply With Quote
Old 07-20-2016, 09:28 PM   #5
Member
 
Join Date: Feb 2016
Posts: 36
Quote:
Originally Posted by Spk64 View Post
With power removed I would check all the wire connections. They can work loose and humming will increase.
I had a loose neutral and the humming was much better after tightening.
Also depending on which type of coils (AC vs DC) are in the relays will impact the amount of noise.


Steve
I will disconnect from power tomorrow and check connections. This trailer is less than a year old and I suspect the connectors worked loose, or were not tight to begin with.

Thanks
__________________
porchdog2 is offline   Reply With Quote
Old 07-20-2016, 11:36 PM   #6
Junior Member
 
MikeAndPeggy's Avatar
 
Jayco Owners Club
Join Date: Apr 2013
Posts: 29
Quote:
Originally Posted by porchdog2 View Post
I will disconnect from power tomorrow and check connections. This trailer is less than a year old and I suspect the connectors worked loose, or were not tight to begin with.

Thanks
This has been a problem that occurs in most RVs that have one of the less expensive AC transfer switches. I've had a few of them and have even had some replaced but to no avail. For some (stupid) reason, the transfer switches I've had were all installed either directly under the bed, or in the basement under the bed. The DW had problems sleeping because of the noise.

I finally took matters into my own hands and, since I didn't have a generator installed, I bypassed the transfer switch. For those who do not have a generator installed - you may want to do the same is I did. After disconnecting power from the RV, I opened up the transfer switch, loosened all the screws holding the input cable and the output cable and with wingnuts (wire connectors), joined the input wires to the output wires. One of my RVs had 30 amp service and so there were only 3 input and 3 output wires to join together. For the 50amp RV, there were 4 wires. On my RVs the input wires and output wires were all colored the same - red to red, black to black, etc. I filled the wingnuts with silicone to insure no moisture would invade the connections and secured the wires so they wouldn't just hang loose. No more sound and the DW now sleeps more soundly.
__________________
2016 Jayco Eagle HT 26.5RLS
2015 Montana 3910FB
2015 Silverado 3500HD
MikeAndPeggy is offline   Reply With Quote
Old 07-21-2016, 05:48 AM   #7
Senior Member
 
Join Date: Jul 2014
Posts: 7,806
Are you sure it's the transfer switch and not the converter ?

Many are built in the same enclosure.

Just throwing it out there.
__________________
twinboat is online now   Reply With Quote
Old 07-22-2016, 10:02 AM   #8
Junior Member
 
MikeAndPeggy's Avatar
 
Jayco Owners Club
Join Date: Apr 2013
Posts: 29
Quote:
Originally Posted by twinboat View Post
Are you sure it's the transfer switch and not the converter ?

Many are built in the same enclosure.

Just throwing it out there.
I'm positive. We're on our 10th RV now and I've done minor and major work on all of them. Only one of our RVs had a humming converter - fortunately it hummed only slightly and only when some of the 12v lights were on. The lights were turned off at bedtime so no humming at night.
__________________
2016 Jayco Eagle HT 26.5RLS
2015 Montana 3910FB
2015 Silverado 3500HD
MikeAndPeggy is offline   Reply With Quote
Old 07-22-2016, 11:23 PM   #9
Member
 
Join Date: Feb 2016
Posts: 36
Quote:
Originally Posted by twinboat View Post
Are you sure it's the transfer switch and not the converter ?

Many are built in the same enclosure.

Just throwing it out there.
Yes........transfer switch.
__________________
porchdog2 is offline   Reply With Quote
Old 07-22-2016, 11:31 PM   #10
Member
 
Join Date: Feb 2016
Posts: 36
checked all lugs, nothing loose. The currant draw vibration seems to be the main deal,when I fiddle with the cover to the TS box the hum will change.It is not something i cant live with, just wanted to know what was causing it.I fret alot
__________________

__________________
porchdog2 is offline   Reply With Quote
Reply

Tags
noise



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
"Loud Noise From '15 DS Transfer Switch Box? hugh37 Newmar Owner's Forum 22 08-22-2015 11:36 AM
What is that buzzing coming from the 50 amp service box? Kent0826 Winnebago Industries Owner's Forum 5 04-24-2015 08:22 PM
Automatic transfer switch loud buzzing keeps us awake! mcaimh Monaco Owner's Forum 6 03-19-2012 11:51 PM
Buzzing noise front AC Unit Mel B Fleetwood Products Owner's Forum 1 10-21-2007 02:07 PM
buzzing rattling noise when accelerating... David Elwarner MH-General Discussions & Problems 5 05-24-2007 01:02 PM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:32 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.