Bat Voltage Error!! - MVAgusta.net
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post #1 of 9 (permalink) Old 06-09-2018, 01:28 PM Thread Starter
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Bat Voltage Error!!

Hello!!
A couple of days ago this message came out on the dash and thank God I was very close home as I turned off the bike and never came back on.
Brought the bike back to the garage hook it up to my lithium battery tender (lithium battery on) and let it charge it. with a multimeter got readings of 13.3V with engine and key turned off and 13.2 and going lower after a couple of minutes with engine on.
Surely something is not working as battery doesn't get charged.
I still have to figure out if it is the alternator/generator or stator or rectifier.... (or hopefully just one of the 2 30 amp fuses.
My question to any of you who may know and hopefully help is:
Do you know or suggest any other manufacturers of any parts above who are not OEM and hopefully of a better quality as shipping fast to NY?
I am afraid MV will take their sweet time for any of those parts.
Don't want to miss the riding season, already short in NY!!
Thank you very much to you all!
Have a great weekend!!

Annalisa, Brutale 800 RR 2015
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post #2 of 9 (permalink) Old 06-09-2018, 01:33 PM
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So, you are just going to throw parts at it until it is resolved?

Diagnosing the issue is far cheaper; but, in the spirit of trying to help here. I have a 2015 Brutale 800RR with 1700 miles on it...I'll sell it for $12K and that should solve all of your issues.

It runs great!

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post #3 of 9 (permalink) Old 06-09-2018, 01:38 PM Thread Starter
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No, I am not going to throw parts at it...
But one of the part is not working. I will surely diagnose it next week when I can, but thought of starting asking here if anybody knows about other manufacturers.
Mine as 20000 miles by the way....

Annalisa, Brutale 800 RR 2015
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post #4 of 9 (permalink) Old 06-09-2018, 02:03 PM
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Pretty good run there.

I am not sure of cross-referenced parts for the 800 series.

I suppose that ADVANCED SEARCH under TOOLS would be your friend in this endeavor.

The testing for those components is straightforward and outlined in the manuals, which you can get here: Team Double 3 Racing | MV Agusta

Perhaps, as indicated, your battery is simply knackered. These bikes are designed with a Lead-Acid or AGM battery, so perhaps the Li is taxing the charging system.

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post #5 of 9 (permalink) Old 06-09-2018, 02:38 PM
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What does the Li battery voltage go to when you hit the starter button? If it is dropping significantly then it may just be the battery...like close to 9 volts.

The charging system is simple to troubleshoot. As with pretty much every modern bike using permanent magnet alternators, you only have 4 components. The stator (or alternator), the regulator/rectifier, the battery, and the wires connecting them all.

First step (after confirming battery condition with a load test):
Find the plug coming from the engine (stator) with 3 wires all the same color/size. Unplug it and measure the resistance of the 3 wires to each other. Should be very low, like around 1 ohm.
Then test any of the three for insulation from ground (the engine case). Better be infinite on the highest scale your meter has.
Then start the engine and measure between each possible pair of wires for AC voltage. Expect 70+ ACV at idle. If that is good you have 2 things left.

Check all wiring continuity, insulation and connections from stator to regulator/rectifier and to the battery.

When all that is good there is only the regulator/rectifier left. Normally the rectifier portion is simple to test with a diode tester (measuring voltage drop across each of the 3 bridges in the rectifier). See the service manual for procedure and specs.... No good test for the regulator. But since you have eliminated everything but that part with testing...replace it.

Older MV models (and other bikes) with an automotive type excited field alternator which includes the reg/rec are slightly different and more complicated testing, but the principals are all the same.

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post #6 of 9 (permalink) Old 06-09-2018, 04:14 PM Thread Starter
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Thank you very much for your help!
I’ll try to test all the components on Monday.
My local mechanic said that 90% is the rectifier/regulator. I would like to try to fix the bikes myself to save money and time.
Does anybody know if it does exits a qualitatively better regulator for 800 RR?
Thank you

Annalisa, Brutale 800 RR 2015
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post #7 of 9 (permalink) Old 06-09-2018, 05:16 PM
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Not sure who makes the MV reg/rec.... Probably one of the Japanese suppliers that make them for pretty much everybody. All the OEM rectifiers are pretty good. Aside from mounting layout and connectors, any similar capacity reg/rec will work. Just need to consider battery size and electrical system demands.

A reg/rec from a Hon/Kaw/Suz/Yam 600~1000 sport bike would work fine, if you can mount it and connect the harness.

The cheapo aftermarket ones are a "get what you pay for" proposition.

Just so you know, the most common cause of reg/rec failure is over heating ...usually from trying to work with a toasted battery with high internal resistance.
Do not jump start your dead battery bike and ride around hoping the battery will "come back to life".

That or modifications or riding that does not allow adequate airflow to cool. Put your hand on a properly working reg/rec and it will be HOT.

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post #8 of 9 (permalink) Old 06-13-2018, 09:11 AM Thread Starter
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Thank you very much for your reply!!
When cranking the bike, battery voltage went down to 9.7 V...
Too low?
Thank you

Annalisa, Brutale 800 RR 2015
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post #9 of 9 (permalink) Old 06-13-2018, 09:23 AM
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Quote:
Originally Posted by Brutale76 View Post
Thank you very much for your reply!!
When cranking the bike, battery voltage went down to 9.7 V...
Too low?
Thank you
Yes.

That voltage is way too low. Your ECU will not allow bike start at that voltage.

Time for a new battery.
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