05 910s died on me yesterday :( - MVAgusta.net
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post #1 of 19 (permalink) Old 01-19-2014, 07:06 AM Thread Starter
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05 910s died on me yesterday :(

turned bike on, took off out of street, noticed the battery light was on the dash. thought it was odd, bike fired up easily, so thought its the dash playing up. so preceeded on to get fuel for the bike. got to local servo and filled up. Bike started easily again, i reset trip meter, and saw red battery light still on, but flickering at idle, I revved the bike and the light became solid.

thought i'd head for home to play it safe. was 5 min from home when the bike spluttered for a short time, then went again, dash then went blank while tacho still worked. then bike spluttered, and finally stalled.

when i rolled to a stop, i hit the starter... nothing, zip, nada. dash was still blank.

call someone to come collect me, got the bike home, i left it alone while i did some more packing of things in prep for our move. went back to the bike that evening, and the bike barely turned over for a second, then the starter solinoid clicked...... flat battery.

So, whats going wrong? stator? or the stupid SPU unit? i havent yet had a proper look at the bike, as im in the process of moving house. but will have some spare time through the week to assess whats going on. thought i'd ask you lot for some suggestions as to where to start looking and what to check?

cheers.joe.
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post #2 of 19 (permalink) Old 01-19-2014, 07:30 AM
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From what you describe it is alternator failure. Charge battery get a volt Meyer test battery off bike for good voltage. Install in bike fire it up hold approx 4k revs and test to see if battery receiving a charge. Also check grounding wires to battery and onto engine case near alternator, clean up contacts.
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post #3 of 19 (permalink) Old 01-19-2014, 10:56 AM
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Yep, alternator.....may want to check 40 amp charge system fuse? I think there is one of those, but not near my bike or books to confirm.

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post #4 of 19 (permalink) Old 01-19-2014, 03:43 PM Thread Starter
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ok thanks guys i'll put the bike on charge once home from work this arvo.
will report back


cheers.joe.
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post #5 of 19 (permalink) Old 01-20-2014, 12:00 AM
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regulator....

charge battery, read voltage across terminals at 4,000 rpm.....it's in the manual's electrical trouble shooting guide

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post #6 of 19 (permalink) Old 04-03-2014, 09:53 PM Thread Starter
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well, I finally got round to fixing my MV yesterday.

I ordered a second hand Alternator from the UK it arrived 2 days ago, after much swearing at the bastard dropping motors and the like, I got the new alternator in place, charged the battery... start the bike.. yay! it ran, but.. charge light still on wtf?

spent an hour reading threads about these sorts of issues on here, and come across the 40amp charging fuse. but most of the threads this related too was the F4 and its 40a fuse is located on the LH side near the water pump.... aint there on a B4! so after more cursing, I found the starter solenoid, with two 40a fuses attached... BOTH were fcked, one was so burnt out it was blacker then black! the other the body had melted quite a lot.

so I replaced them both with some 30 amp fuses just to test it out, fire it up, low and behold, no charge light, battery shows 15.1v @ 2000 rpm. which is a bit high I would have thought?

so bike runs again for now! im going to go get some 45 or 50 am fuses to "fix" the issue I think lol. I wonder about the WHY this happened tho? its on the forums a bit actually and I am curious to understand why a 40am fuse cannot handle the load? has someone come up with a fix for this issue?

cheers.joe.
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post #7 of 19 (permalink) Old 04-03-2014, 10:51 PM
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Should have downloaded the Workshop manual, then you would have found the fuses first up. Also, only one of those 4oAmpers are the fuse used, the other is a spare. Now have a look in the workshop manual, there's a great fault finding section in there on the charging system.

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post #8 of 19 (permalink) Old 04-04-2014, 02:16 AM
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Which means, the fuse blew and was replaced prior to your issue.

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post #9 of 19 (permalink) Old 04-04-2014, 03:02 AM
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check your regulator/rectifier. It should be charging at just over 14v perhaps this is why the fuse has blown before.
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post #10 of 19 (permalink) Old 04-04-2014, 08:13 AM
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There is a range specified in the workshop manual. In another thread I seem to remember it can be as high as 15.2 VDC and be in spec.

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