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Old 06-22-2002, 11:04 AM   #1
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Join Date: Jun 2002
Posts: 3
Question Strange noise?? Univolt?? Brakes??

Just bought a '76 Excella 500, central bathroom. When plugged in the 120 V hear a noise behind the oven that sounds like a motor running. Its not the water pump that can be turned on/off on the panel above the range. Any ideas?

About the Univolt... do I understand correctly the the 120 V circuits, lighting, etc., will operate off of the 12 V battery?

Brakes... the brakes on the wheels are hydraulic, yet the trailering electrical connector has a terminal for brake? I'm confused. Also there is some sort of "plunger switch" extending from the front, sort of behind the propane tanks, that is labelled about pushing to release the brakes. More confusion!

Any and all help and enlightenment will be greatly appreciated. Thanks
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Old 06-22-2002, 02:09 PM   #2
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1983 27' Excella
Airstreamville , Kansas
Join Date: Feb 2002
Posts: 410
First things first, Congratulations on your new Airstream.
I may be mistaken but I think the univolt is in the oven area on your year/model and the noise you hear should be a humming or low buzzing is your univolt at work.

The same lights should work off 12v as 110v unless you have a seperate circuit for certain lights to run off 110v only.

The electrical terminal for brake is probably for brake lights, the rest of the system I am not familiar with.

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Old 06-22-2002, 04:41 PM   #3
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1986 25' Sovereign
Southern Middle , Tennessee
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Check out my response in the Community Forum to virginiak question "What do I have to get to tow?" I explained how the 4 wheel hydraulic/vacuum disc brakes work. The hose is connected to a coupling mounted on the vehicle which gives you a vacuum source from the engine. The knob behind the tanks and below the brake system reservoir releases the brakes once the trailer has been parked. To fully appreciate the system, you need a service manual.

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Old 08-07-2020, 09:59 AM   #4
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1991 36' Land Yacht
West Paducah , Kentucky
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I have not enough experience to even suggest a solution, but I heard a similar noise, and finally opened an exterior cabinet door to find a little air compressor that was apparently stabilizing the rear axle air-ride suspension.

I'm just sayin'
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Old 08-07-2020, 10:13 AM   #5
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1994 34' Excella
Warren , Manitoba
Join Date: Apr 2006
Posts: 848
That noise is the Univolt. Remove and replace with new 3 or 4 stage converter. Been there, done that!! Best money you will spent on your trailer.
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