Mysterious Not Start Issue - 1st Problem! - MVAgusta.net
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post #1 of 16 (permalink) Old 06-04-2016, 02:47 AM Thread Starter
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Mysterious Not Start Issue - RESOLVED

Hello Gents,

I just passed 30K trouble free miles on my '08 Brutale 910S and just had it's first major issue! The bike has been so reliable, I'm a poster child in town because I don't get teased for having an Italian bike! The bike has been sitting for 3 weeks and I assumed my 1 year old EarthX lithium battery was the culprit. (can't hook up a charger due to my living area at the moment) The bike has been running as reliable as a Japanese bike and have kept up all scheduled maintenance since I took her home almost 4 years ago. My last ride was uneventful 3 weeks ago, everything was perfect.

NO START. The only lights that come on are the neutral, battery and oil LEDs in the dash when I turn on the ignition. Removed the battery and recharged it overnight. Has over 13.8 volts and put it back in the bike. Same issue. No sign of any electrical activity except the 3 lights in the dash. No horn, no clicking, fuel pump etc. No load showing on battery when ignition is on. It just seems like a dead battery issue. Hooked up my buddy's F4 battery and still nothing. Checked all fuses and all are good. So tired from working 14 hours today and going to bed. Does anyone have any obvious suggestions for items to check before I begin serious troubleshooting in the morning? Thank you!


88 BMW M5 (Dinan Stroker -Euro Conversion)
2008 MV Agusta Brutale 910S
2016 Range Rover SVR

Last edited by M5zealot; 06-06-2016 at 07:21 PM. Reason: Resolved
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post #2 of 16 (permalink) Old 06-04-2016, 03:01 AM
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When you turn the ignition on you should get all the dash lights on for a second or two and hear the fuel pump prime. If it's not doing that then it is most likely a fuse fault or the CPU maybe going bad. Does yours have a blue back to it or a black back?

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post #3 of 16 (permalink) Old 06-04-2016, 03:17 AM
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Wow,what a stunning looking bike,just love that Burnt Orange colour.Very much sounds like a SPU issue which Jim meant to say (typo).
Have a read here-
http://www.mvagusta.net/forum/showthread.php?t=41943


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post #4 of 16 (permalink) Old 06-04-2016, 03:28 AM
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And to add to what Jim and Mitch said, make sure you connected the battery correct, that you didn't swap polarities by mounting the battery upright instead of on its side.

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post #5 of 16 (permalink) Old 06-04-2016, 10:22 AM Thread Starter
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Thanks for the replies! Going down to the garage and check on the SPU. It looks like all the symptoms stated in several threads show pretty serious gremlins. I have not experienced any of the turn signal, headlight or bike continuing to run gremlins ever in four years. I was just hoping there was a major relay that is known to fail and easy to get too for this, just like on my M5. Oh yes, always make sure I have polarity on the battery correct. I would have to be in a coma to get that wrong. I'll keep you guys updated.

88 BMW M5 (Dinan Stroker -Euro Conversion)
2008 MV Agusta Brutale 910S
2016 Range Rover SVR
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post #6 of 16 (permalink) Old 06-04-2016, 03:33 PM
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Has the neutral switch managed to sit between on and off and is kidding the electrics in thinking the bikes in gear.


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post #7 of 16 (permalink) Old 06-04-2016, 07:08 PM
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Quote:
Originally Posted by MVAGOGO View Post
Has the neutral switch managed to sit between on and off and is kidding the electrics in thinking the bikes in gear.
The Neutral switch is a single wire switch which goes to "earth" when switched, so it's either on or off. The rest of the system should still work regardless.

Sorry if the battery question annoyed you OP, even some of the most experienced guys on this forum got this wrong at some stage.

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post #8 of 16 (permalink) Old 06-04-2016, 10:41 PM Thread Starter
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Hey, guys. The comment about the battery didn't annoy me at all. I was really said in jest. I had a reverse polarity issue when I was helping my dad restore a classic car when I was a teenager. The car not only burned down but almost took the whole house too! You only make that mistake once!

I couldn't see the color of the SPU w/out removing the tank and had to help another buddy w/ a more serious issue today. I did see in another thread the newer SPU has only 12 fuses instead of 13 in the old one. Mine has 12. I check a few more connections and all seem to be fine. One issue that tells me it is the SPU is when I turn the key, there is no load on the battery. I got a new battery today just to eliminate that possibility. Read a constant 12.8 to 13.9 volts w/ ignition on or off. No power is making it to the rest of the bike! I followed the main positive cable from battery as far as I could go without taking the tank off and there was continuity. (I got a new WPS lithium battery.)

Is there anyway to test the old SPU before relieving my wallet of $500+? I had a buddy who was able to fix the ECU on my BMW many years ago by just looking at the circuit board and finding a few loose solders! I'll see if the dealer has one on hand for troubleshooting next week. Thanks again for all the suggestions and keep them coming. I'm sad I didn't make it to the 5 year mark of trouble free motoring this year. I still love you Brutale no matter what!

88 BMW M5 (Dinan Stroker -Euro Conversion)
2008 MV Agusta Brutale 910S
2016 Range Rover SVR
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post #9 of 16 (permalink) Old 06-04-2016, 10:43 PM Thread Starter
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[quote=MVAGOGO;1977474]Has the neutral switch managed to sit between on and off and is kidding the electrics in thinking the bikes in gear.[/quote

Thanks for the suggestion. As I stated, the neutral indicator is one of only 3 lights in the dash that work with ignition on. (Battery and Oil) Donzy is correct.

88 BMW M5 (Dinan Stroker -Euro Conversion)
2008 MV Agusta Brutale 910S
2016 Range Rover SVR
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post #10 of 16 (permalink) Old 06-04-2016, 11:45 PM
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Okay, if there's nobody around to swap a SPU with it might be a bit tricky mate.
Id start by just going through the bike and checking for bad connections, start with the main circuits as there's only a few big cables involved.
Then the smaller connections, ECU plug, SPU plug and the Dash plug.
Check the (-) connections, their prone to corrosion and are often ignored when people do fault finding.
I hope you find something before you have to buy a new SPU mate.

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