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Old 2 Weeks Ago   #1
barnett468
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Default 2009 st1300 not charging

Has a new battery. Bike only runs a few miles before draining the battery even with the lights off.

Tested it with a volt meter while it was running and it is not charging.

Since it runs when the battery is charged up does this mean that all the fusses in the charging circuit are good?

Does this have a separate voltage regulator?

Any easy way to test the alternator directly?

Do you have to disassemble half the bike to get to the alternator?

Is this going to cost me $1,000 to fix?


Thanks for any help.

Last edited by barnett468; 2 Weeks Ago at 08:16 PM.
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Old 2 Weeks Ago   #2
Rob2m
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Default Re: 2009 st1300 not charging

Probably unless you do it yourself. There is one lead from the alternator that supplies current and its bolted on, I don't recall hearing of one coming loose but I guess its possible. The alternator lives in the v of the engine block under the fuel injectors and thermostat, any leaks from the water works there may cause issues. Have you had any leaks? and what year and mileage?
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Old 2 Weeks Ago   #3
barnett468
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Default Re: 2009 st1300 not charging

Quote:
Originally Posted by Rob2m View Post
Probably unless you do it yourself. There is one lead from the alternator that supplies current and its bolted on, I don't recall hearing of one coming loose but I guess its possible. The alternator lives in the v of the engine block under the fuel injectors and thermostat, any leaks from the water works there may cause issues. Have you had any leaks? and what year and mileage?
2009, 56,000 miles, no leaks.

about how long does it take to replace it?

thanks
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Old 2 Weeks Ago   #4
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Default Re: 2009 st1300 not charging

Quote:
Originally Posted by barnett468 View Post
2009, 56,000 miles, no leaks.

about how long does it take to replace it?

thanks
Depends how good you are with spanners!

Its plastics off, tank up, water out and carbs off, it may just be brushes on the alternator although it's a fairly long process if you are unfamiliar with them it may pay you to get someone else to look it over prior to refitting. If your doing it yourself use caution on the lower bolt, it's very easy to round the head.
Don't ask me why I know this.
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Old 2 Weeks Ago   #5
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Default Re: 2009 st1300 not charging

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Originally Posted by Rob2m View Post
Depends how good you are with spanners!

Its plastics off, tank up, water out and carbs off
He means injectors.
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Old 2 Weeks Ago   #6
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Default Re: 2009 st1300 not charging

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Originally Posted by echo View Post
He means injectors.
Ah, good spot, you have been upgraded in my book from site tit to grammer tit, well done.
Did you have anything technical to add Echo, was there an adult there when you spotted this?
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Old 2 Weeks Ago   #7
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Default Re: 2009 st1300 not charging

What's the voltage difference across the battery with the bike turned off vs. running? Should be around 12.6V with the bike off and around 14 volts with it running. If voltage across the battery drops with the engine running vs. with it turned off, your alternator is not charging. Check all the fuses, including the big one on top of the battery. If that all looks good, you have a bit of a job to access the alternator.

Run the bike until there's no gas in the upper tank, remove the upper tank, airbox and throttle body assembly (lots of hoses, cables and connectors so keep track) peel back the rubber thermal blanket and you'll see the alternator toward the back of the engine V. The thermostat is located in front of rather than above the alternator. I removed the radiator and the t-stat housing to remove mine, but I've heard others that managed without doing that. The regulator and rectifier are integral with the alternator, no separate component anywhere.
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Old 2 Weeks Ago   #8
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Default Re: 2009 st1300 not charging

Thanks for the info.

I forgot to mention that this is an ex police bike and i found out today that this is a very common problem on the police models.

yes, i am handy with spanners but lack enthusiasm for this ordeal, lol.

Does anyone have a copy of the actual r and r process from the manual?

How do i know when the gas is out of the top tank?

can't the gas be siphoned out of it.

i can't run it for more than a mile or two before the battery dies.

.

Last edited by barnett468; 2 Weeks Ago at 08:36 PM.
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Old 2 Weeks Ago   #9
Rob2m
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Default Re: 2009 st1300 not charging

You can do it with the tank still connected and in the upright position.
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Old 2 Weeks Ago   #10
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Default Re: 2009 st1300 not charging

In my experience with Police bikes whoever wired the lighting/radar/siren/general cop stuff is guilty of a criminal act.
I'd bet the farm your problem is within the wiring.
Look for anyplace they "tapped in" to power up whatever.

The shop manual is essential.
They are not year specific.
When you look for one be sure it covers the 08 model as well as your specific model.
I believe they all have the "P" model amendment, except 03-04 manuals, in the rear section which is needed for the swingarm pivot torque sequence.


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