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Old 01-23-2012, 06:25 PM   #1
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Surge Guard making loud buzzing noise

I just purchased a 2010 Discovery 40x. I have only been connected to shore power twice but both times it is making a load buzzing noise in the bathroom. I pulled off a panel next to the breaker box to find a Surge Guard model 40250 that seems to be the problem.

Is this normal? Maybe there are some loose wires in this thing causing vibration?

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Old 01-23-2012, 06:33 PM   #2
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It's not normal and could be a possible bad relay. Pull the cover and see if you can locate the buzzing noise.

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Old 01-23-2012, 11:02 PM   #3
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It could be loose electrical connections. I would shut off all power and tighten down on all of the lug screws, all wires.
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Old 01-25-2012, 04:56 PM   #4
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Does it smell, like arcing may be occuring? Is it hot to the touch, or warm for that matter? If so, there is definately a problem inside the device.
Occasionally, internal parts may shake loose, allowing them to be subject to the 60 cycle hum we have become familiar with through florescent lights and the like.
It may not be field serviceable, so, if it does not smell or feel hot, you may have to put up with it, or move it around, try to re-position it so it does not hum. In all seriousness, if it was mine, I would get it open, or replace it, you really do not want to fool around with electrical stuff that is not working at 100%. They may be expensive to replace, but not as expensive if it completely fails, and causes a fire....
Back to a 5'er after 4 yrs fulltime.
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Old 01-25-2012, 08:00 PM   #5
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Check with TRC for warranty.
I hard wired my Surge Guard model 34550 into the coach when new, and some time later the relay began a constant loud buzzing noise and the case seemed pretty warm. I used the key to operate in bypass mode until TRC provided a new unit. Replaced under warranty and no hassle. Allowed me to use old unit until new arrived, having to un-wire and rewire twice would have been a pain.
Check your connections at the unit but I think it voids the warranty to open the case...
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Old 01-25-2012, 08:44 PM   #6
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Sometimes it is as simple as the mounting bolts or screws holding it in place just need tightening
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Old 01-25-2012, 08:49 PM   #7
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It isn't normal.

Since you just purchased the Discovery (if you purchased it from a dealer) I would take it back to the dealer and let them repair/replace it.
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Old 01-26-2012, 07:48 AM   #8
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Let me add one more thing. On my previous MH by battery charger would buzz so much it would keep my wife awake at night. I tightened the mounting bolts and it stopped.

You might find this interesting
Surge Guard humming - BAC Forum - beaveramb.org

Read the second question down
Surge Guard® FAQ | Technology Research Corporation
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Old 02-03-2012, 06:29 AM   #9
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Thanks everyone for the input. I have decided to let the dealer fix the Surge Guard since I am still under warranty.

I will update this thread when I find out what the problem was.


Porky and Lucy
2010 Discovery 40x; 2008 Wrangler Unlimited
On the hunt for MTB and hiking trails!
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