Question about 2000 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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Voltage reulator puts out 14 volts and engine light comes on engine rpms go down voltage goes down light goes out until rpm increase

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It sounds like the voltage regulator is doing what it is supposed to. The charging system should put out between 14-15 volts when the battery is fully charged in your bike.

Now what is causing your engine light to come on is beyond me.

Posted on Feb 04, 2010


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Alternator or Voltage Regulator or Other?

You will need to test the charging system. Try this simple test, hook a voltmeter to the battery and check the voltage with the key turned off. Should be 12 volts. Now start the engine and note the volt meter reading at idle, it should go up to about 13.8 - 14.2 volts. Rev the engine up and note what happens. If the voltage is low at low RPM 12V and then goes up with more RPM like you stated it could be the regulator or the alternator. Start by switching out or trying another voltage regulator. If this does not fix the problem you will need to test and repair the alternator. The alternator out put can be tested by bypassing the regulator. This requires special equipment and know how. I hope this gets you

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My 1999 sienna xle's battery light goes on at 1000 or 1500 rpm and stays on until it gets below those rpms. I have tested and had o'rielly's test the alternator and it read 13

When you had it tested, did you take it off the vehicle and have it load tested on the bench.....or did they simply take a voltage reading at the battery with the vehicle running? If the latter, did they rev the engine to see what the voltage did at the higher RPMs? There are two possibilities for the problem. First, the drive belt could be slipping on the alternator pulley at higher RPMs. This could be due to a loose or worn belt, a bad belt tensioner, or possibly worn bearings on the alternator. If the belt is not in question, then the alternator is most likely having problems regulating the output voltage when the RPMs get over a certain value. Alternators will make an ever-increasing internal voltage in relation to the engine speed; it is the voltage regulator that must manage the output to approximately 13-14.5 volts.

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I have a 01 flht the has a problem with the voltage or charging system the bike volt gauge sits around 11 volts at idle but when driving the bike around 2 thousand rpm the volt gauge reads at 14 volts the...

Sounds close.

The faster the engine's RPMs, the faster the alternator spins, causing the voltage to increase.
The voltage regulator (as the name implies), regulates the voltage coming from the alternator, and going into the electrical system.
Factory instrument gauges are not alway accurate, and more so just gives you a rough idea of what is going on.
A better test is to get a DC voltmeter, and connect to the battery terminals and see what's going on.
At idle, should be about 11-12-13 volts.
When the engine is reved, it should never go above 14-15 volts.

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1 Answer

On initial start, alternator fails to register 14 volts until engine is excelerated to 2700 rpm

many alternators will not register at 850rpm.s as the regulator requires a higher out put than 12.5v to start to work It should be charging 13.5v at 950-1000 rpms and move up to 14.5 from that rpms to a max voltage of 15.5v.l It could have dirty slip rings and worn brushes so I would remove it and have it bench tested as car tacho's at idle can be out and it may be idling slower than it actually reads

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89 Yamaha virago 750 while riding lights go dim and engine cuts out unless bike is revved up then engine runs and light come back (sometimes) what's the problem?

You have a charging fault, it sounds like 1 phase of your alternator is down , so giving a low charge rate check in this order.
alternator winding resistance at the plug/ skt into the regulator and,or reg/ rectifier unit
the plugs clean and connections good.
next the out put voltage which should be about 13-14 volts just above idle, lights off, rev engine up to 2-3 thousand revs voltage should be 14.5volts,turn on the lights voltage should not drop to under 13 volts with the engine above 2k rpm.
low charging rates are normally down to alternator and wiring issues not the regulator which if faulty wil give no out put , so no chage at all

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1 Answer

Intermittent alternator

Hi Denny, 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

Sep 09, 2013 | Harley Davidson FLHTCUI Electra Glide...

1 Answer

1994 SL1 Code 14 hard cold starts,and revs to about 2500 Rpms onstart then dies.

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1 Answer

I have a 2001 flhtcui what are the ac reading coming from stator at 2.5k rpm 3k rpm and 3600 rpm. At 2000 rpm I get about 12 volts dash guage reading but at 3000 I get 13.5 to 14 at lower rpm 2000 or so I...

The AC output of the stator should be 32-40 volts at 2000 RPM (16-20 per 1000 RPM). With the battery fully charged, your regulator should supply between 13.5 and 15.0 DC volts to the battery. This should be the reading you get on your voltmeter. It will vary depending on what lights and other equipment you have turned on. Sounds like everything is working fine to me. The gauge is reading the DC voltage at the battery while the engine is running. At 2000 RPM, 12 volts is a little low but, considering the accuracy of the gauge, as long as it doesn't fall below 12 volts, it's about right. You don't ride for extended periods at engine RPMs that low. Then at 3000 RPM, 14 volts is about right. If your bike never ran anymore than 12 volts, your battery would slowly go down. If it goes any higher than 15.0 volts, it will boil the battery. Usually, about 14.3 or so with no load on the system is about right.

Good Luck

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1 Answer


Check that the alternator and charging circuit is actually working. You can do this with a voltmeter across the battery terminals. Check the value with the ignition off - you should see 12.1 and 12.5 volts. Then start the engine and leave it on idle - you should see between 13.8 to 14.2 volts. Watch the voltmeter as the gas is pressed down. With the engine revving around 2000 rpm the voltmeter value should increase up to something like 14 to 14.2 V but not increase any further with an increase of engine revs. If you see voltages of 14.5V or above then the voltage regulator needs replacing.

Note that if you constantly see voltages of 12V or less with the engine switched off then the battery should be replaced as it will not hold charge and gradually drain down as you are experiencing to a point where it will not turn the car engine.

If you don’t see any increase in battery voltage, or the battery voltage falls, when the engine is switched on then either the alternator or the voltage regulator need to be replaced.

Nov 19, 2009 | GMC Sierra 1500 Cars & Trucks

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Signal lights will only come on after 10-15 minutes of running

Sounds like time for a new battery. But first check the water level in each battery cell. There should be water covering the plates in each cell. Get a 1amp or a 2 amp trickle charger and put it on overnight. Start the bike in the morning and read the voltage with a volt ohmmeter at the battery terminals while the bike is at about 4000 rpm. Voltage should be at 14+ volts. If it is, and the battery will not hold a charge, then a new battery is called for. If the voltage is less than 14 volts then the battery is not getting re-charged by the bike. Check the wire connection from the battery to the flywheel. be sure all connections are clean and tight and that all wires are hooked up. Be sure there are no loose wires, pinched wires or abraded wires. If problems are still present then you should take the bike to the dealer and have them check the stator, regulator and rectifier.

Please rate this solution. Thanks!

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