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03-09-2016, 10:09 AM
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#1
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Junior Member
Join Date: Feb 2016
Posts: 24
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Buzz at power switch when plugged in
Have had my rig for a few months. The power switch has had a slight buzz or hum when plugged into shore power since I got it. It recently has become slightly louder.
Is this normal? Is it a problem? Can I repair it?
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03-09-2016, 10:25 AM
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#2
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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Please identify what you mean by 'power switch.' If you're talking about the automatic transfer switch, it might have a 60 Hz buzz. You could check that all fasteners are tight to see if it changes.
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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03-09-2016, 11:42 AM
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#3
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Junior Member
Join Date: Feb 2016
Posts: 24
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Quote:
Originally Posted by BFlinn181
Please identify what you mean by 'power switch.' If you're talking about the automatic transfer switch, it might have a 60 Hz buzz. You could check that all fasteners are tight to see if it changes.
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Thanks, yes, I mean the automatic transfer switch. Okay, I will check fasteners.
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03-09-2016, 01:16 PM
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#4
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Senior Member
Join Date: Apr 2008
Location: On the Road
Posts: 1,223
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If you could identify the maker/model of the ATS it would be helpful. Is addition to checking the connections, the contacts may be able to be cleaned. If that doesn't help then a replacement contact assembly might be available or just replacing the switch. Make sure all power is off!
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Dan & Arlene
2005 Monaco Dynasty Diamond IV
Chasing the good weather
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03-11-2016, 05:03 PM
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#5
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Senior Member
National RV Owners Club Ford Super Duty Owner
Join Date: Sep 2010
Location: Horse Town USA, CA.
Posts: 3,781
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If you replace the transfer switch make sure is has DC coil relays. One's with AC coils will tend to hum, DC don't.
__________________
1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat Pickup 6.0 Diesel Crew Cab DRW, 4X4, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000,1994 36ft Avion 5er, GVWR 13,700, 2,740 Pin Weight.
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03-11-2016, 10:40 PM
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#6
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Senior Member
Forest River Owners Club
Join Date: Dec 2010
Location: Livingston, TX
Posts: 1,088
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Most all transfer switches have a slight hum to them.... Nothing to worry about I wouldn't think...
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03-12-2016, 08:34 PM
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#8
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Senior Member
National RV Owners Club Ford Super Duty Owner
Join Date: Sep 2010
Location: Horse Town USA, CA.
Posts: 3,781
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__________________
1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat Pickup 6.0 Diesel Crew Cab DRW, 4X4, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000,1994 36ft Avion 5er, GVWR 13,700, 2,740 Pin Weight.
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03-12-2016, 09:55 PM
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#9
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Senior Member
Winnebago Owners Club Solo Rvers Club
Join Date: May 2015
Posts: 1,834
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I have a DSI water heater and when I have the AC electric heat switch on the water heater control board makes a high pitched noise, not loud enough to hear in the coach but can hear clearly outside by the water heater, not exactly a hum or buzz but could this be what you are hearing?
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Randy - Manhattan, Kansas
2015 Vista 27N
2020 Ford Escape Hybrid
[SIGPIC][/SIGPIC]
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03-13-2016, 10:35 AM
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#10
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Senior Member
Join Date: Nov 2014
Location: TEJAS
Posts: 813
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Quote:
Originally Posted by chboone
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The key phrase is, "• Designed with dc coiled relays to reduce hum,"
You can't just substitute a dc relay into a application supplying ac power.
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03-13-2016, 11:20 AM
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#11
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Senior Member
National RV Owners Club Ford Super Duty Owner
Join Date: Sep 2010
Location: Horse Town USA, CA.
Posts: 3,781
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__________________
1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat Pickup 6.0 Diesel Crew Cab DRW, 4X4, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000,1994 36ft Avion 5er, GVWR 13,700, 2,740 Pin Weight.
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03-13-2016, 11:46 AM
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#12
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Senior Member
Join Date: Nov 2014
Location: TEJAS
Posts: 813
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Went to the website, downloaded the repair parts pdf, looked up the timer delay board and found a picture of it.
It has a full wave diode bridge and a storage capacitor on the left side. It converts the ac to dc to energize the relays.
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