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Old 05-27-2008, 02:57 PM   #1
76 Argosy 28' MH
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1975 28' Argosy 28
Springfield , Ohio
Join Date: Dec 2006
Posts: 46
alternator squealing

This is my 3rd alernator i have put on. The last one is a 135amp. Did great going camping, charging good everything seemed to be doing great. Went about 130 miles, camped for 3 days and on the way home, didn't get far, i started to here a squelling sound just like on the other 2. Amp gauge starting falling off but did not drop in the negative range. Made it home OK but the squelling never stoped. It did however would stop when i was at a stop or traffic light. Once i started moving it would start squelling again. Belt good and tight and is new. Any help would be great. 76 Argosy 28'

Thanks John

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Old 05-27-2008, 04:46 PM   #2
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1978 31' Excella 500
Venice , California
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Squealing's just about gotta be a belt. This could also mean belt/pulley combo or possibly that the vibration damper on the crankshft is defective and slipping.Not much else qualifies.

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Old 05-27-2008, 05:34 PM   #3
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1993 21' Sovereign
Colfax , North Carolina
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If it's got a serpentine belt, the tensioner could have a bad bearing, or the pulley on the alternator could have loosened up.
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Old 05-06-2009, 08:03 PM   #4
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2005 30' Land Yacht 30 SL
Oakland County , Michigan
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2005 LY 30 SO / New Serpentine Belt

I had an awful squealing noise coming from my engine compartment, but no alternator problem. Took it to the Cauley Chevrolet dealer here in West Bloomfield, MI (an approved Workhorse facility). They replaced the serp belt with the same kind, but the problem came back. The next time they used a different kind of belt and cured the problem. Can't remember what kind of belt they used, but if you need to know, email me and I'll look it up. They said they had this same kind of issue on many of the Corvettes they sell and solved it the same way. Go figure. I'm just glad they fixed the squeal on my new MH.
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Old 05-06-2009, 08:43 PM   #5
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1967 24' Tradewind
Wickenburg , Arizona
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Sounds like maybe a bad reguletor. It my be full fielding which means its putting out 135 amps even if the battery doesnt need it. When you rev the motor it will make more amps(135in this case) than at an idle, hence the belt squeeling when you throttle the engine up. On a 1976 I would think the alt has an internal regulater which means a junk alt. My experiance the last few(20) years is rebuilt alts are not rebuilt,and are junk. This seems to be espessially true of NAPA brand.OEM is the way to go if you want to keep moving, or get a small reputible electrical shop to rebuild it. Adios, John
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Old 05-06-2009, 09:24 PM   #6
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1989 29' Land Yacht
Mesa , Arizona
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loose belt?

Make sure belt is tight.
Try putting some belt dressing on belt.
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Old 05-07-2009, 06:46 AM   #7
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Common Sense , Texas
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Had the same problem on a Dodge truck I had after replacing the serpentine belt. Come to find out it was slipping on the airconditioner pully and causing the squeel. After changing back to the old belt, the problem went away. Sold the truck a year later with the same old original belt on it.

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