Charging Problems - MVAgusta.net
 
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post #1 of 7 (permalink) Old 06-28-2009, 12:20 PM Thread Starter
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Charging Problems

I've seen so many posts on this forum about charging problems that I thought I'd share some information about a problem that I've had, just in case it might help someone else.

I recently did a track day at Cadwell Park and my bike went really well all day. Then as I started my bike to come home I noticed the charging warning light had come on.
I set of home, but had to stop for fuel after about ten miles. After I fuelled up I started the bike and the charging light had gone out and I rode home ok. Since then the light has come on and gone off again several times, but last Wednesday the bike died on me while I was out riding with friends. The battery was flat and even if I bump started the bike it would run rough and die after a few seconds.
Anyway I got a friend to take the bike home in his van.
I charged the battery overnight and read loads of posts about the problem, and the next day I checked various things like fuses and battery voltage etc. Whilst I was checking the charging fuses I discovered that the nut that fastens the main output wire to the alternator was loose. I guess that's why my fault was intermittent.
I tightned the nut and checked the ouput of the alternator which was 14.2v at tickover and 14.5v at 2000rpm.
Everything is now fine, which is a big relief as the bike is just out of warranty.
So if you are having similar problems, it's a good idea to check that the nut holding the output lead to the alternator is tight.
Cheers

Hank

Hank_UK
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post #2 of 7 (permalink) Old 06-28-2009, 12:55 PM
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Thanks for the posting!

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post #3 of 7 (permalink) Old 06-30-2009, 08:00 AM
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any pics where the nut holding the output lead to the alternator so i know where to look next time =)
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post #4 of 7 (permalink) Old 06-30-2009, 09:53 AM
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Excellent. Thanks for the post

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post #5 of 7 (permalink) Old 06-30-2009, 10:37 AM
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Useful piece of info thanks I second some pics if possible as well.

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post #6 of 7 (permalink) Old 07-01-2009, 11:10 AM
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How is it that your bike reads 14+ volts at tickover? The alternator on my F4 doesn't charge until around 1800-2000 rpm and it's been my impression that all F4's are that way due to the gearing on the alternator drive.

I got mine. Boy do I ever got mine.
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post #7 of 7 (permalink) Old 07-02-2009, 03:24 PM Thread Starter
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Picture of Alternator Lead fixing nut

Quote:
Originally Posted by lee View Post
How is it that your bike reads 14+ volts at tickover? The alternator on my F4 doesn't charge until around 1800-2000 rpm and it's been my impression that all F4's are that way due to the gearing on the alternator drive.
Hi Guys,

I am attaching a picture of the nut that holds the output lead to the alternator.
You will need to remove the mounting screw that holds the Charging relay, and two other relays, and move the bracket to one side to gain access. (see second image)
The image is taken from the manual, and is with the engine removed from the frame. I've added a second image that shows the bracket with the relays to give an overview of the location. You can see the alternator behind the frame rails, and you will have to pull of a rubber gromet on the end of the lead to reveal the nut attached to the alternator.

I've heard of F4 alternators giving low voltage at tickover, all I can say is mine gives 14+ volts at tickover.

Cheers
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Hank_UK

Last edited by Hank_UK; 07-02-2009 at 03:34 PM.
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