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Old 02-04-2012, 12:31 PM   #1
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Location: Mississsippi
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ISO relay Continous Buzzing

I just recently purchased a 06 Monaco MH, w/ISX Cummins.
The problem is I keep hearing a buzzing comming from the rear run box. The noise is comming from the large ISO relay located in the box. It gets very warm to the touch. I disconnected the battery using the main cut off switch located in the battery compartment. Buzzing stops.

Question- Is this normal or do I have a real problem?

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Old 02-04-2012, 01:34 PM   #2
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Posts: 2,200
You have a problem. You should see the volts and other information listed on it. Either take it out or take pictures of it then taken it or the pics down to an electrical shop. Some of ours were doing that too. We were able to get new ones for about $35, list price is more than double. Yours may cost more or not. It only took about 5 to 15 mins to change each one out.
Thom is certified and his company has accounts at most electrical places and as long as the money comes out of his pocket and not billed to his company they don't care.

Thom and Christine having fun in a 1993 Monaco Crown Royale Signature Series 40ft 300hp RV. Towing a Fiat 500 Abarth and a Harley.
Our blogged repairs and travels
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Old 02-04-2012, 02:43 PM   #3
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I have had our coach for about a year and a half. Its a 2005 model. My relay hums. The original owner said it had always done that. I will ignore it until something other than the hum goes wrong with it. It works fine.

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Old 02-05-2012, 06:49 AM   #4
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I have been concerned about this ever since we arrived home with it. Since the rig is new to us, I wanted to know if all the bells and whistles are working.
I apprecate the responce.
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