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Mechanics 101 Can't get it to run right? Find a trick to add HP?
From the first oil change to completely rebuilding the engine,
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Old 06-19-2018, 02:30 PM   #1
kolez
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Default Bad Alternator?

Hi everyone, new here so I apologize if I couldn't find an already posted answer.

Was riding today, lost speedo, and tach. Shortly after the bike died, battery completely dead. Will run if I bump it, but dies quickly when the battery is depleted. Are the tach and speedo driven off the alternator? I've looked for bad connections, but am not seeing anything apparent. Its a 2004 GSX600F

Thanks!
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Old 06-19-2018, 05:20 PM   #2
92xjunker
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Sounds like it. The bike should still run if the battery dies while running. Though the electrical on the bike won’t like it at all, as the voltage will climb trying to charge a bad battery. Charge the battery. Start the bike and check the voltage at the battery while running, check it again at 2k rpm. Should not be dropping 14v should be around what you see.
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Old 06-19-2018, 08:26 PM   #3
SmdirL
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A quick check that I've always used for cars which will work on bikes as well is to just disconnect the battery while the vehicle is running. If it stays running, the alternator is good, and if it dies it isn't.
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Old 06-23-2018, 08:21 AM   #4
kolez
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Thanks guys for the replies.

I replaced the spark plugs last week, and am starting to wonder if some water got into a connection. I charged up the battery and started it last night. Voltage across the battery was constant at 14.23 / 14.24 volts while running idle - 4k. Unhooked the negative lead from the battery while it was running, and it stayed running.

Tach was working again as well. Haven't been out on it since this happened, but suspect the speedo will be working again too.

I hate when things seem to fix themselves - makes me nervous lol. If anyone has any other suggestion on what it could or could have been I am all ears!

Thanks again!
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