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Title: Battery not charging on Monster 2009
Post by: freshmilk on March 18, 2023, 09:57:48 PM

Battery not charging on Monster 2009

Anyone have experience with Monster battery not charging?
If stator diagnosed as OK, regulator replaced, what are the other suspects?

SHORT

Battery starts at 12.3v and ends 3-4mile ride at 10.5v
Motorcycle Mechanic (MM) voltage tested stator and OK
MM recommended replace REGULATOR but battery still not charging
Rotating through 2 different batteries and both end with low voltage
Acid battery 18mths & 3 mths old

LONG

Bike (12,500 miles) complete shut down at traffic stop and would not start again
Had it towed
Figured it was bad battery and bought Li-Ion battery but that died
Went to mech shop for help and they tested with voltage meter
Battery and Stator ruled out as OK and replaced regulator as likely culprit
Battery still not charging and voltage reading in the 10s according to bike OSD
Spark plugs replaced
Never had issues with bike running until 3 months ago with the shut down
Installed, pigtail for battery tenderer, front and rear cameras
Using Noco GENIUS1 to charge batteries. Supports acid, AGM and Li-Ion
YTX14H-BS 18mth old
Caltric Agm Battery 3mth old

Title: Re: Battery not charging on Monster 2009
Post by: ducpainter on March 19, 2023, 03:04:11 AM

Check the large fuse for the alternator. It's not in the fuse block. It's in line near the battery.

Title: Re: Battery not charging on Monster 2009
Post by: greenmonster on March 19, 2023, 04:09:00 AM

Wiring to/from regulator OK? Check at engine block and connectors.
What regulator did you buy?

Title: Re: Battery not charging on Monster 2009
Post by: freshmilk on March 19, 2023, 10:41:02 AM

Quote from: ducpainter on March 19, 2023, 03:04:11 AM

Check the large fuse for the alternator. It's not in the fuse block. It's in line near the battery.

Will try replacing all the fuses to rule them out. Thanks for highlighting the alternator fuse

Title: Re: Battery not charging on Monster 2009
Post by: freshmilk on March 19, 2023, 10:41:38 AM

Quote from: greenmonster on March 19, 2023, 04:09:00 AM

Wiring to/from regulator OK? Check at engine block and connectors.
What regulator did you buy?

I bought a Ducati OEM regulator

Title: Re: Battery not charging on Monster 2009
Post by: freshmilk on March 21, 2023, 04:15:13 PM

For anyone else who has similar issues, turned out to be the regulator.

Bought a new regulator from Amazon for USD25 and now the instrument panel shows 13.8-14.3v.

Thanks to everyone for their input and suggestions

Title: Re: Battery not charging on Monster 2009
Post by: greenmonster on March 22, 2023, 04:50:26 AM

Quote

.I bought a Ducati OEM regulator

Quote

.Bought a new regulator from Amazon for USD25

???
So why didn`t the Duc one work?!?

Ducati Monster Forum

Moto Board => Tech => Topic started by: freshmilk on March 18, 2023, 09:57:48 PM