1090 battery not charging - MVAgusta.net
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post #1 of 74 (permalink) Old 11-23-2016, 11:56 AM Thread Starter
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1090 battery not charging

Hi everyone, just bought a used 2014 1090r with 4,500klms which was fitted with a new exide battery as the previous owner had already replaced 2 others beforehand claiming they went flat because he never got time to ride it.

On day 3 it broke down and wouldn't start as the battery became too low from riding and it would not turn the engine over fast enough to start, later it then took over 3 hrs on the charger to top it back up and then it started easily.

The battery was taken to be checked but was ok and I was told the problem was the bike not charging it.
All fuses were then checked and a meter was used on the bike and confirmed it was not charging the battery.

The connections for the regulator/rectifier were checked and sprayed but it still was not charging and so a new regulator was purchased and fitted and the battery was then toped up and the bike was run for 50klm and then placed on the charger and once again it took 3 hrs to top it back up.

When I ride it the battery first drains from the initial start up and then continuously from the headlight being on, any ideas?
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post #2 of 74 (permalink) Old 11-23-2016, 12:03 PM
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Have your alternator tested.

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post #3 of 74 (permalink) Old 11-23-2016, 02:29 PM
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What voltage are you getting at the battery with the motor running?


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post #4 of 74 (permalink) Old 11-23-2016, 07:59 PM Thread Starter
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12.3 volts today with new regulator.
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post #5 of 74 (permalink) Old 11-24-2016, 12:50 AM
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Download the manuals from Donsy's web site. There is a test procedure to be followed religiously. E.g. Fully charged battery.
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post #6 of 74 (permalink) Old 11-24-2016, 01:58 AM
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Faulty alternator.

I'm surprised you don't see any indication of this on your dash ?

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post #7 of 74 (permalink) Old 11-24-2016, 04:55 AM Thread Starter
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Thanks Donsy,

Looks like the generator then, its booked in on Monday to the local Suzuki, Ktm dealer to have the offending item identified and removed.
I will print out the relevant workshop manual pages for them.

$650 for one of these items so I am not happy with the fact I just purchased a faulty bike that should have been fixed under warranty by the previous unknowing owner.
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post #8 of 74 (permalink) Old 11-24-2016, 06:56 AM
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Note that the check is done at (or slightly above) 2000 rpm.

If you do it at idle, the generator is not spinning fast enough to put out design voltage through the regulator.

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post #9 of 74 (permalink) Old 11-24-2016, 11:39 AM Thread Starter
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we had to checked the voltage at 3,000rpm as it was impossible to hold the revs at 2,000rpm due to the crap fueling, it was either 1,500 rpm or it would jump to 3,000rpm.
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post #10 of 74 (permalink) Old 11-24-2016, 06:49 PM
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Exclamation wtf????

too much bullshit in this thread

1. the manual is wrong, charging at 12.6 volts is wrong it's not charging it's

DISCHARGING...... you need to be over 14 volts at IDLE or you kill batteries

2. Chuck, have you TESTED your output at Idle?.... didn't think so

3. mvaussie take the alternator to an automotive electrical shop bet the repair is less than $100

maybe half that

find out what's wrong before throwing parts at

my '08 910R with an 8 year old battery......

battery voltage 12.69 volts

key on 12.22 volts

idling 14.79 volts

2000 rpm 14.81 volts

4000 rpm 14.84 volts

my sister's Honda Element, my friend Jackie's 2 Honda Elements and my Mother's

Lexus RX 330 all charge UNDER 13.5 volts and eat batteries

find Brian's post about the dealer that pulled the MOTOR 3 times and haven't fixed the

alternator yet.....labor so far ? over 1,000£


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Last edited by theknurl; 11-25-2016 at 08:36 PM.
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