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Old 01-07-2012, 06:03 PM   #71
Bill Harris
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Joined: Sep 2008
Location: backwoods Alabama
Oddometer: 6,307
Ah, 12v. My memory dims.

If the battery only gets up to 11.xx volts after being on the charger (several hours, overnight) that batt is bad. Charge it overnight on a Battery Tender til it goes to a float charge. It should maintain 12.4 +/- volts for several hours. Get a battery hygrometer (the floating ball thingie that tells 1/1 charge, 1/4 charge, etc) and measure the charge in each cell. They should all be 1/1 or at least 3/4 charge.

The bike's alternator needs to put out more than 12.4 volts to keep the battery charged; the 13.5-14v is generally optimum.
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