Electrical: Brutale 910S not charging - MVAgusta.net
 
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post #1 of 9 (permalink) Old 01-06-2018, 09:10 PM Thread Starter
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Electrical: Brutale 910S not charging

The battery icon illuminated out of the blue. Checked the 40 amp fuse, replaced the battery, still no joy... Bike has a year-old upgraded SPU.

I'm about ready to take the alternator to an auto-electric shop for diagnosis and possible re-build. Bike is a 2006 with 8,200 miles.

Thoughts? Suggestions?


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post #2 of 9 (permalink) Old 01-06-2018, 11:25 PM
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Check the output across the battery terminals while it's running. Should be just over 14v or thereabouts.

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post #3 of 9 (permalink) Old 01-07-2018, 01:01 AM
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Check the output across the battery terminals while it's running. Should be just over 14v or thereabouts.

Cheers

Deano
If it fails this, know that you have to lift the frame or drop the motor to get it out. Some old threads for the F4 say you can wiggle it free without unbolting the motor but our Brutales have a couple of brackets which hold those plastic inserts that get in the way. I struggled for too long trying to do it the "easy" way when just dropping the thing really wasn't bad.
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post #4 of 9 (permalink) Old 01-07-2018, 10:45 AM Thread Starter
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Thanks, guys. I verified the output across battery terminals first, not charging. With the 40 amp fuse verified and a fresh battery in place, is the alternator the next logical culprit? Looks like an automotive-type alternator, I'd imagine an auto electrical shop should be able to troubleshoot and fix, no? I don't even want to ask what a new alternator from MV is likely to cost!


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post #5 of 9 (permalink) Old 01-07-2018, 11:25 AM
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Quote:
Originally Posted by Bootworks View Post
Thanks, guys. I verified the output across battery terminals first, not charging. With the 40 amp fuse verified and a fresh battery in place, is the alternator the next logical culprit? Looks like an automotive-type alternator, I'd imagine an auto electrical shop should be able to troubleshoot and fix, no? I don't even want to ask what a new alternator from MV is likely to cost!
Yes.....Denso unit, basically same as many small cars.

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post #6 of 9 (permalink) Old 01-07-2018, 10:14 PM Thread Starter
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Yes.....Denso unit, basically same as many small cars.
I was reading the comments you wrote on the subject in 2010, great help.


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post #7 of 9 (permalink) Old 01-13-2018, 09:03 PM
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Before you pull the alternator, check the 4 wire connector on the starter solenoid for corrosion also between the
alternator and 40 amp fuse easiest way is to remove solenoid

Years ago I had corrosion inside a wire going from the battery to the voltage regulator
Voltage regulator wasn't seeing battery voltage and wouldn't charge
Took a while to figure that one out


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post #8 of 9 (permalink) Old 01-13-2018, 09:46 PM Thread Starter
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As it turns out it was wiring, no need to pull alternator. Spooky, Noel!

In the process of chasing this gremlin down I dropped a 'Scorpion Stinger' lithium battery in, my old Yuasa was fried. I've got a couple of Shorai, they're quite a bit more expensive, but this battery seems to have limitless cranking power and, at least so far, doesn't seem quite as cold-shy as the Shorais. At $140 I think they may have something here.


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post #9 of 9 (permalink) Old 01-13-2018, 11:13 PM
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Congratulations!

Alternators are very reliable, I have one with 327,000mi on it, it's 53 years old and needed 1 bearing, still on
the original brushes
Usually it's corroded connections or wires incorrectly connected, blowing things up ......
I hate to think what MV wants for an alternator

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