Question about 2008 Honda GL 1800 Gold Wing

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Yesterday I had to be towed home.Last night i charged the batt. This morning I did all of the tests that was listed in the servise maniual here is what i have Voltage test at 2000 rpms is at 14.50 volts.The batt volts is 13.12 volts. Servise Manual saids that I should have 15.5 volts. Do I need to get a new alternator? Or replace the Batt? Thank you for your time Steve

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What the manual is telling you is the output of the alternator should be 15.5 volts as the max. Most alternators run at 14 to 15 volts and that is sufficent to charge a lead acid battery to 13.2 volts as that is the rated voltage of a 12V battery 2.2 volts per cell times 6 cells =13.2V. Of course some batteries may indicate slightly higher and slightly lower, but you need an input voltage from the alternator higher than 13.2 in order to charge the battery. I think that your alternator is proper and that your battery is at fault. It indicates that you may have a malfunctioning cell and the battery will charge up but the cell may have an internal short that runs the cell down and causes problems. You may have to check each cell individually after a short run. The other problem to look for is a dead short that may be draining your battery faster than your alternator can replace the voltage. A stuck brake light switch or an accessory can drain a battery.

Posted on Mar 20, 2011


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