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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1 Answer

Charging system failure low voltage

Hi Anonymous, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12 volts or better after charging.
3. Make sure all connections are clean and tight especially the negative cable at both ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v replace battery.
5. With engine running at 3600 RPM battery should read 14.3-14.7 volts if not continue tests.
6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to:
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace rotor. Good luck

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883 want turn over, all lights on as normal just clicking sound.

Check the battery connections. If they're loose, this may be the problem.

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Voltage meter problems

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.

May 11, 2012 | 2004 Harley Davidson FLHTCUI Electra Glide...

1 Answer

94 flstc. On first start-up, 35 AC stator, 14.5 v off battery. About 15 minutes into ride, lights dim to near nothing, battery always needs a charge after even a short ride. Regulator?

It sounds to me to be the battery. if you have a digital volt meter charge up your battery and first with the bike off check your voltage at the battery if this is between 13 and 14.5 volts that's a good voltage (but the cca ((cold cranking amps)) can be off) after you've gotten your voltage start the bike and test for voltage at 3000 rpm or 10% throttle if the voltage is over 16 volts or has not changed and starting to drop, check the connection to the stator and regulator located at the front of the primary chain case on the inner primary and that the long single wire from the regulator to the battery is good check 3000rpm voltage again if this did not fix the problem then you may have a problem with your voltage regulator.

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1 Answer

My 2003 FLHTCI sat for six weeks or so and needed a charge to start. Got it home and put it on a 2 volt trickle charger ver night. Started one time then no more. Bought new battery, running and charging...

No, the battery should charge at 14.5 to 15.0 volts. No problem. The 12.5 to 13.5 is not high enough to keep your battery charged especially if you do a lot of night time riding. You're fine.

Good Luck

Sep 22, 2010 | 2003 Harley Davidson FLHTCUI Electra Glide...

1 Answer

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Sounds like your charging system is not charging the battery.

Put a volt meter on the battery, run the engine up to maybe 2,000 RPM. The voltage must be at least 13.8V, but not more than 14.5.

If that is all OK, your battery is worn out, and is not holding sufficient reserve. It would need to be replaced.

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first things first change the spark plugs and then make sure ya have fresh gas it as well.

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Battery will not keep a charge.

Get a 2 amp charger and charge the battery fo 3 hours or so. While the battery is charging,check the fuses and check the wiring harness connections between the flywheel and the battery.

Start the bike and rev it up. Use a DC voltmeter to check the battery voltage while running. The voltmeter should read 14+ volts. If not then there may be a problem with the stator.

Pleas rate this solution. Thanks!

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