2009 Monster 1100 Hard to start - Ducati Monster Forums: Ducati Monster Motorcycle Forum
 
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post #1 of 7 (permalink) Old 01-28-2019, 08:12 AM Thread Starter
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2009 Monster 1100 Hard to start

Hi all,
I found my 1100 hard to start after an hour riding. (engine is hot / not a cold start). I thought it could be caused by a bad battery. After a new battery changed, I checked the battery information on its dashboard. The reading is about 13.5V ~13.9V. After about 30 minutes riding, I found the reading dropped to 12.5V or even lower. When I rev up, I think the Bat Voltage should be higher than 12.5V.
The attached image is the BAT reading while my rev-up my 1100.
Any Monster 1100 owner can help me to check your monster.
1. The engine is working- Cold (not warm yet) : the Battery reading on the dashboard.
2. The engine is working- HOT (after 15-20 minutes riding):the Battery reading on the dashboard.

I want to check if my M-1100 has a regulator issue or it's normal as others.
(I thought the reading on the battery - while riding should be higher than 13V or the battery won't be charged fully.)

Thanks in advance for your help.
Regards,
Oliver
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post #2 of 7 (permalink) Old 01-28-2019, 09:44 PM
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Quote:
Originally Posted by Oliver Yeh View Post
... After about 30 minutes riding, I found the reading dropped to 12.5V or even lower. When I rev up, I think the Bat Voltage should be higher than 12.5V....
Regards,
Oliver
Sounds like battery not getting charged.
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post #3 of 7 (permalink) Old 01-28-2019, 10:56 PM Thread Starter
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Thanks

Same as my guess.
But I heard that the battery voltage will not always above 13V, is that correct?
If any 1100 owner can help me to confirm my 1100 is not normal on the voltage. That would be great.
Thanks for your reply.
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post #4 of 7 (permalink) Old 02-05-2019, 10:28 AM
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Hi Oliver,

I confirm that the voltage should be around 14v with the engine running.
Anything below 13.5v and you have a rec/reg issue.

Cold voltage should be between 12-13v.

Hope it helps.
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post #5 of 7 (permalink) Old 02-05-2019, 11:22 AM
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Hello Oliver

The charging voltage should be 14v - 14.5 with engine running.
I also have a 2009 1100 with 30,000 mile on it. When I did the valve shims for the 30K maintenance and removed the oil cooler shrouds, I noticed that the voltage regulator connector sockets were either corroded and/or had gotten hot. probably due to high resistance from the corrosion.
The regulator is attached to the right side oil cooler shroud. Once you detach the shroud, pull it toward you and reach in to separate the connector. You may have to cut a zip tie to unfold the harness.
There are three yellow wires that supply high voltage to the regulator. If you have a loose or dirty connector causing high resistance, you may have reduced voltage to the regulator and, therefore, low output to the battery.
Just something for you to check.
If you find this is the situation and you replace the connector yourself with an aftermarket connector, be careful to make sure to mark the yellow wires before cutting anything to prevent changing their relationship to each other.
If you have a clean connector, then bring it to a dealer or reputable shop that can check the regulator and the alternator for proper function.
Hope this helps.

Leon
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post #6 of 7 (permalink) Old 02-05-2019, 06:33 PM Thread Starter
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Great help, thanks LeFraussie and Leon.
I will check the regulator first to see if the root cause is bad connection or regulator.
Thanks for the details information for my action, Leon.
Best regards,
Oliver.
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post #7 of 7 (permalink) Old 02-19-2019, 10:27 PM Thread Starter
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Thanks all,
I ordered a new regulator and installed yesterday. The voltage reading is 14.4.
Cold star is normal now, and I will ride for the hot engine testing this Sat.
Thanks for all the supports from you guys.
Oliver
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