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Discussion Starter · #1 ·
I have a 2008 1800 with 28K on the clock. Purchased it this spring from a reputable dealer at 24K. At idle it has a noticeable growl in the engine. Experimentation has yielded a belief that it has something to do with the alternator. If I load up the electrical system the growl vanishes immediately. i.e. depress any brake lever; turn on bright headlamp; turn on driving lights---anything that causes the alternator to begin producing current makes the noise go away. Do not hear it at speed but that doesn't mean it is not present. Is not affected by clutch or drive train movement---only adding draw to the electrical system. Have asked a couple of dealer mechanics---not usual. Anyone have any thoughts?
 

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Discussion Starter · #3 ·
Yes, I hear the 1800 whine. This is not. This is a low frequency with a variable cadence following rpm at slow throttle. Depress the brake lever or any other device that uses more amps and it stops--instantly. I am suspecting a dry bushing or bearing.
 

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That would seem reasonable ( alternator bearing or "clouded brush")...

Have you read up on the Alternator Drive Gear issues on the 1800s? The original ADG was a bit wonkey and was redesigned (05-05 I think??), but some people still have issues.

Exploring the alternator itself would be the low cost 1st step, IMHO
 

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My 2010 is doing the exact same thing,32,500 miles tun brights on noise goes away, Press brake lever noise goes away. Only makes noise at idle and in neutral. Seems when you load up the electrical the noise stops. Help!
 

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Larry,

Your 2008 DOES have the redesigned ADG. The redesigned ADG with the fluid coupling started with the 2006 model.

The 2005 and earlier GL1800s had the old mechanical design and they were very prone to failure. Long story, but there is a small retainer clip in there that would shake itself loose and then the thing would vibrate and eventually ruin itself internally.

There is a very very small failure rate on the 2006 and up ADG, so I suspect your problem is elsewhere.

Good luck with it.
 

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I have the same noise,apply the brakes noise stops,turn on brights and noise stops. Did you ever get a fix?

Thanks Bwhitg. Question is for Larry.
Welcome to the forum Bwhitg

The op hasn't replied to anything other than the above and may not have his preferences set to receive an email notification when someone posts to this.
You might find you'll get a better response if you start your own new topic and describe the condions you have. I haven't run into the sound mentioned above.
 
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