Question about 2003 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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Harley 03 Ultra overcharging, 16 volts

Bike has always charge somewhat high (14volts +) but this year when I went on my first ride about 3 weeks ago it was normal charge at idle but when riding it looked pegged at 16 volts. Majority of opinion seems to be regulator. A friend that had a charging problem says when his compensating sprocket came loose (as mine did a few months before his) it wore the inside of the rotor (charging system on brakes) and may be effecting the quality of his charging system. He suggested that could be part of my problem as well. Others seem to think that would cause DIScharging not overcharging. Any suggestions, or opinions?

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14v is not overcharging. 16v is pushing it. I'm with the regulator opinion, but I would also load test your battery. If the charging system thinks your battery is low it will try to compensate by putting out max voltage, putting additional strain on the regulator, which in turn overcharges the battery... creates a vicious cycle. Is the regulator in a spot where it gets quite warm? They have a tendency to overcharge when hot. If that is the case, try relocating it or directing more airflow over it.

Posted on Jun 26, 2009

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The problem could be several things. Do you have lots of electrical accessories or lights on the bike? If so, your charging system isn't putting out enough juice to run them all.

To test the charging system, remove the seat. Place the positive and negative electrodes from a multi meter on the corresponding terminals on your battery. Make sure the meter is set to "DC volts". With the bike running at idle, the reading should be around 12.8 volts dc. Run the bike up to 2000rpm. The reading should be around 13.8-14.4 volts dc. Do this test with all electrical accessories turned off. If you don't get these readings, chances are your stator is headed south.

The problem could also be the voltage regulator or the gauge itself. Hard to diagnose the problem with limited info.

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