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Old 03-22-2013, 10:07 AM   #1
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Location: Indiana
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Question Strange sound

Took my 2004 allegro mh back to dealer I got it from, to have new roof ladder installed as the one on the rig was missing the bottom half. A couple of hours later got new complete ladder installed. The problem is, when I inserted key and turned it to the on position I heard a grrring sound (I believe is was under the dash, but not sure), but it started ok and I checked and everything appeared ok. Since I'm new to this I was thinking jacks or something like that. Got it home with no problems that I know of, but I went out to start it and got sound again. Not for sure what it could be. Any idea's?

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Old 03-22-2013, 10:13 AM   #2
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Air pump for air conditioner vent controllin on dash and floor? See if your AC controls are in the off position.

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Old 03-22-2013, 10:22 AM   #3
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Some RVs have a vacuum pump motor that operates the dash comfort controls...heat, vent, cooling. Sometimes it also provides a vacuum to the cruise system. It usually comes on when you turn the key to on. If your vacuum system is OK, it'll run a few seconds and then shut off. If there's a leak, it'll keep running.

Or, you may have an auxiliary brake motor that is used in conjunction with the Hydroboost braking system. If you step on the brake without the engine running, it'll make a noise similar to what you described.
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Old 03-22-2013, 11:50 AM   #4
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The air reserve for my air horns has a small electric pump that kicks in and will run for about 2 minutes to pressurize the tank.

You didn't mention if the sound went away after a while.

Also sometimes the volume control gets turned up on my rear view camera which will cause noise.
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Old 03-22-2013, 11:58 AM   #5
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If this is a Ford F53 chassis, you are hearing the electric motor that runs the brakes and steering in case of an engine dying.
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Old 03-22-2013, 03:15 PM   #6
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Originally Posted by ga traveler View Post
If this is a Ford F53 chassis, you are hearing the electric motor that runs the brakes and steering in case of an engine dying.
Same thing applies if you have a Workhorse W-series chassis, and your foot is on the brake pedal, before the engine start or after it is turned off.
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Old 03-22-2013, 04:17 PM   #7
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x2 on the back up camera volume. Did that one myself. Though something was wrong, but it was the sound of my trailer behind me.
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Old 03-22-2013, 08:38 PM   #8
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You didn't leave the dog tied to the back bumper.

I can imagine him getting angry each time you start the coach

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