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Old 12-04-2010, 07:41 AM   #1
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djhinds's Avatar
Monaco Owners Club
Join Date: Sep 2010
Location: Golden, Colorado
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Transfer switch hums

The transfer switch on my 04 Monaco Sig hums when on shore power or on the gen. power. It has an Esco Power 50 switch and I found the manufacture's web site trouble shooting page. It says I need to remove the contacts as they have dust on them and clean them. DUST ON THEM YOU SAY, I guess the DW has 1 more thing to dust now... Has anybody else had this problem and what did you do to fix it? Is this an indication of switch failure in the future? I would not think dust would make a difference. Also should I put Dielectric Grease on the contacts for better contections.


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Old 12-04-2010, 07:54 AM   #2
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I think dust is the wrong term but they probably use it to avoid explanations. The transfer switch is a set of relays as such over time the contacts can arch and need cleaning. The power from the Generator also goes to a time delay circuit that engages the relays to switch over to the generator. If the power doesn't get through the relay contacts well, they can hum or even chatter. What you need is a burnishing tool, not a feather duster . This one will work fine and doesn't cost much.

Be very sure all power is off before you even open the transfer switch enclosure. If not you'll find what we use to call, "The Deadly Shipmate", when I was in the navy.

1999 Tradewinds 7372 Cat 3126
Albuquerque, NM
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