alternator/voltage regulator problem - BMW Luxury Touring Community
 
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post #1 of 5 Old Jan 1st, 2010, 11:49 am Thread Starter
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alternator/voltage regulator problem

2005 K1200LT. about 15,000 miles Battery light stays on, battery only few months old. With engine running at rapid idle, meter shows 11.5 volts. Any ideas of problem? Another bike that I had lost part of the voltage regulator, and I only got about 10 volts then. I kind of suspect same problem. I appreciate anyones help/advice. Thanks, Ron
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post #2 of 5 Old Jan 1st, 2010, 1:41 pm
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Re: alternator/voltage regulator problem

So what's the voltage with nothing turned on, key off?
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post #3 of 5 Old Jan 1st, 2010, 6:33 pm
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Re: alternator/voltage regulator problem

Check to make sure the little blue wire is on it's connector on the side of the alternator. It is a real bear to get to but that could be the issue. I have not seen an LT with an alternator failure at low mileage but there have been some with high mileage and worn brushes. Sounds like it is not putting out if all you get off idle is 11.5 v. Check all connections as well.

John
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But lack DE, MA, RI and CT with the 2005 LT

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post #4 of 5 Old Jan 1st, 2010, 7:40 pm
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Re: alternator/voltage regulator problem

Quote:
Originally Posted by jzeiler
Check to make sure the little blue wire is on it's connector on the side of the alternator. It is a real bear to get to but that could be the issue. I have not seen an LT with an alternator failure at low mileage but there have been some with high mileage and worn brushes. Sounds like it is not putting out if all you get off idle is 11.5 v. Check all connections as well.
With the wire off, the light will not come on, and he said his stays on. Sounds like he has lost the alternator or voltage regulator in it. The mileage is too low for worn alternator brushes, so I would suspect the regulator. It could be loose ground or battery connection.

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post #5 of 5 Old Jan 1st, 2010, 8:18 pm
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Wink Re: alternator/voltage regulator problem

Like John and David already said, I would check connections before plunging into any parts replacements. We're talking about the alternator side connections, not you main battery connections, since the implication here is that the Bike starts OK, just putting out low voltage. Either corrosion or a loose connection can give these symptoms.

Good luck!

John

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