Help. Bike won't turn off headlight. - MVAgusta.net
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post #1 of 30 (permalink) Old 06-05-2016, 08:47 PM Thread Starter
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Help. Bike won't turn off headlight.

Hi, guys, my first post because I thought I could deal with this problem. But 6 months and I'm over it.

I have a 2007 910r, NEVER had any problems. 6 months ago I was driving on the freeway and I noticed the high beams (indicator and the highbeam light) coming on (without the button) for a few minutes, then flickering on/off, then off for half an hour, but then remaining on for the most part.

Occasionally they would flicker back to normal. This went on for a while.

Fast forward a few months, and now they are on 90% of the time when the bike is on. Not the worst problem...EXCEPT...now when I turn the ignition off, the light stays on (either high or low beam). Even when the key is in off (or park or lock or whatever combination you want) and removed. The catch is that they will be off sometimes, like when the bike hasn't been running too long. 3/4 times they just stay on and 4/4 times I just disconnect the terminal when parking so I can actually drive home without a dead rat for a battery.

Yeah, really f* annoying. Is there a bad relay or something, or the ignition switch is bad?; I don't get it the bike has been stored indoors all of its existence. I have the electrical diagram and could replace/do this myself I just suck at isolating problems.

Thanks in advance everyone, sorry for the brief intro, can't wait to get this on the road without carrying screwdrivers.

-dp
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post #2 of 30 (permalink) Old 06-05-2016, 08:55 PM
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Sounds like you are needing a new Service Power Unit. Please see my recent post concerning my "no power" issue. It has opened a torrent of despair and frustration. I have found many threads that all lead to this part. I'm just starting to teach myself how to confirm the issue and relieve my wallet of about $500. Good luck.







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post #3 of 30 (permalink) Old 06-05-2016, 09:31 PM
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Typical SPU problem.There is one for sale in the For Sale/Wanted section of the forum.


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post #4 of 30 (permalink) Old 06-05-2016, 10:12 PM
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Welcome to the forum mate.
Please have a look at tip #18 in this section - http://www.mvagusta.net/forum/showthread.php?t=107834

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post #5 of 30 (permalink) Old 06-05-2016, 10:51 PM Thread Starter
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New SPU? That's positively terrifying. I am still at a loss to explain why the headlight would still be on after the key is out. I would think the circuit is cut, so no power would be in a closed loop in the bike to reach the headlight, let alone the SPU. Or is it the other way around. Fml.

What if...big IF...I opened up the SPU, and would find a blown resistor or capacitor that for $0.99 would solve all my life's problems? Solder in a new piece, and bam.
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post #6 of 30 (permalink) Old 06-05-2016, 11:04 PM Thread Starter
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Should I transfer this thread to the "wishful thinking category"?
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post #7 of 30 (permalink) Old 06-06-2016, 12:16 AM
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Cool

Read the thread I suggested, then you'll know how it works, and wether your SPU can be opened or not.
Download the manuals from my site, there a manual in the with some good fault finding sections to start with mate.

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post #8 of 30 (permalink) Old 06-06-2016, 08:08 AM
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Batscape, first, welcome to the madhouse that is MVAgusta.net.
Second, although you may not understand it now, the SPU is your issue.
Third,if you are good at diagnosing cirtcuit board issues and want ot undertake repairing an item that will fail in a different way next...then head on down the Rabbit Hole.

There are numerous SPU threads here. The ground work has been done. Go to the Final Thread on SPUs: http://www.mvagusta.net/forum/showthread.php?t=41943

have a read...and then buy a new SPU approriate for your bike.


Now, if would would put a general location area into your profile, those of us near you could probably help directly.

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post #9 of 30 (permalink) Old 06-06-2016, 12:58 PM
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The easiest way to check for a possible bad SPU, is to check the back panel of the SPU. If it is BLUE then you have one of the old models that can give a world of grief to the electrical system. Not only the lights staying on when you remove the key, but the engine can also keep running after the key is removed.........not logical but it happens.
If the back panel on your SPU is BLACK, then it is the newer updated item that is pretty reliable.
The old SPU can supposedly be repaired, but it's not cheap. Check out the Tech tips section for CPU repair. The company is based in the Netherlands.
You can buy a new SPU from Startwin Trading (good reliable company that is also a forum sponsor), or as I did, order one from your MV dealer, which was no more expensive than Startwin and I didn't have to pay any postal charges!
Fitting the SPU is a pretty straightforward DIY job and takes about 15 minutes.
Hope you get to the bottom of your problem.

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post #10 of 30 (permalink) Old 06-06-2016, 05:21 PM Thread Starter
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I think I did it. This may sound bizarre, but after browsing through older posts you guys helpfully guided me to, I thought that perhaps the battery juuuust might be reversed. As it is, the battery is unmarked (wrapped in foam insulation to fit the case), and unconventional, some Li-po, probably.

It would never have occurred to me the battery was fitted backwards, but I tested the terminals, and sure enough.
Damn. But hooray. Flipped the piglet around, and everything seems to have gone back to normal. Can't believe I've been doing this for months.

So then the battery indicator turned on; after 5 minutes running, the bike wouldn't crank back up. 40amp fuse blew - guess it preferred the battery reversed. Two hours later, recharged battery and new fuse, I think she's good. Fingers crossed.

Thanks all of you guys, time to fill in me profile. I can hold off on the SPU unless it's been damaged by the flip somehow. Thank you!!
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