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Old 12-11-2012, 05:28 PM   #1
vodkamune
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Question Electrical Problems

Hello all.

Not to repeat my self with posts this is starting from the beginning and working out where did i go wrong on fixing this problem.

I started with the following questions in regards to the bike.

1. problem was that i had a discharging battery. The problem was the battery not having power to turn over the engine from a week of sitting around and not running.

2. The bike would run after kicking it over by dropping a gear or jumping it with another car or charging the battery over a tender.

3. After deciding on replacing the battery with a lithium 12 cell the bike started up like a charm. After taking it for a spin the battery light started flashing and then went fully red. After a bit more riding the power started to fade away from my lights speedometer and RPM gauge. Then it just fully shot down and came to a halt.

4. After that happened i changed my 12 cell lithium to my old acid battery and tried on jumping it. After jumping the battery the bike started up but then after i pulled the jumper it died.

5. I checked the fuses next to the battery and found out that one of em was blown so i changed the number 40 fuse for a new one. The battery had no power to turn it over so i tried to see if i could jump it once more it did not work. So i tried a rolling start it turned on for a split second and then died

6. I talked to a tech near my work that do some MV repairs but not electrical work. He told me that starters and alternators dont usually go out of work on bikes. He told me to look into a Voltage regulator
I have no idea where to look for that... i went over all the shop drawings for the bike including the owners manual and could not find anything to do with the voltage regulator.


Now my question can it be something with the SPU, Voltage regulator, or alternator.

Whats the best way to test this problem at this point and time.


I do have a problem with my low beam light as well in regards of it night working. I checked fuse and connections changed the bulb 2 times and no luck.


I dont know any more. In regards on taking it to the shop i wold love to but its a good 50 mils away so i would like to see if i can find the problem before i relocate it to a licensed MV Agusta Dealer/shop.

Thanks guys

once again sorry for re-posting and re Threading. I hope this just gives more of the back story about all the problems.


and do you guys know of a good place to order parts from.

Last edited by vodkamune : 12-11-2012 at 05:32 PM.
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Old 12-11-2012, 05:37 PM   #2
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It sounds like you have multiple issues. Alternator not charging, spu gone or going bad.

I would take the time, drive the 50 miles and bring it to the shop. Unless you are fully competent with motorcycle electronics, it is likely you'll tear your hair out and spend hundreds of dollars swapping parts before you find the problem.

Bring it to someone who can work on the bike, diagnose the problem, and fix it.
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Old 12-11-2012, 06:17 PM   #3
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Did you check if you connected the battery the right way round. Post some pictures. If you blew the 40A fuse, I'm wondering.
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Old 12-11-2012, 06:39 PM   #4
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Quote:
Originally Posted by Donsy View Post
Did you check if you connected the battery the right way round. Post some pictures. If you blew the 40A fuse, I'm wondering.
i have a black from under the gas tank connected to the negative and for the positive i have the red top cable and the small black one that is attached to the positive that is connected to the positive runs back to the negative.

same way it is shown in the manual. 2 to the negative and one to the positive. i will attache pictures later on tonight
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Old 12-11-2012, 07:50 PM   #5
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I think what Donsy is asking is did you connect the battery backwards and fry the diode. That frequently happens.

The black wire going under the tank from the negative post on the battery goes to ground. There is a large black wire from the wire harness connected to the negative post on the battery. The second wire from the wire harness connects to the positive. Another wire goes from the positive to the starter solenoid.

So, you should have two wires on the negative post and two wires on the positive post. Plus, battery charger if you have one.
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Old 12-11-2012, 08:09 PM   #6
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Carl & Donsy;
he did the 40Amp fuse in and probably the diode too

it had to have been connected wrong

then it eats a 12 cell LiPo and he gets the red light

Donsy how long can you run total loss on a LiPo 12 cell?
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Old 12-11-2012, 08:12 PM   #7
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Quote:
Originally Posted by theknurl View Post
Carl & Donsy;
he did the 40Amp fuse in and probably the diode too

it had to have been connected wrong

then it eats a 12 cell LiPo and he gets the red light

Donsy how long can you run total loss on a LiPo 12 cell?
At full blast, not more than 22min, no lights etc.
I see where this is going .
Do the Brutale's have diode's like the F4 Noel/Carl ?
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Old 12-11-2012, 08:26 PM   #8
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Quote:
Originally Posted by Donsy View Post
At full blast, not more than 22min, no lights etc.
I see where this is going .
Do the Brutale's have diode's like the F4 Noel/Carl ?
I have the 2005 750f4 brutale
hmmm so now if its the diode how do i fix that and where can i buy the part.?

Last edited by vodkamune : 12-11-2012 at 08:28 PM.
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Old 12-11-2012, 09:33 PM   #9
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I don't think the Brutales in '05 have a diode. Or if they do, it's not where it is on the F4.
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Old 12-11-2012, 09:35 PM   #10
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Noel, I got the Purox instruction manuals today.

Top man!
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