Question about 2005 Harley Davidson FLHTC - FLHTCI Electra Glide classic

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Voltage regulator shows 10.5 @ idle and 11@ 2400rpm 12 @ 3000rpms

Voltage swings causing batt drainage

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  • alanrdry Jan 22, 2009

    I will do that and thanks.


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Hello Alan,
This is a common fault with H.D. regulators, I would be trying an aftermarket uprated one, there are many out there to choose from and I wouldn't personally advise a particular manufacturer just see what your local Bro's think.
Good luck!
Please remember to rate my assistance,
Paul 'W'
Onyer~EDson(:0) {#><U.K.

Posted on Jan 22, 2009

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Hi There,
9 out of 10 times it is loose battery terminals, corroded terminals. - Clean and tighten.

Test your volatge regulator by attaching a voltmeter to you battery:
With bike off battery meter should read 12.50 +/- .25 volts - anything lower-battery needs charge
With Bike on at idle meter should read 12.80 +/- .25 volts - anything lower-voltage regulator bad
Rev to 2000 rpm meter should read 13.75 - 14.80 volts - anything lower-voltage regulator bad

Before replacing the voltage regualtor make sure the groung wire from the voltage regulator is tight and recheck with the meter.

Check your ignition wire screws, one may have vibrated loose. - Inspect / check for tightness
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Dec 03, 2010 | Harley Davidson FLHTCUI Electra Glide...

1 Answer

1993 Harley Sportster 883 Batt. is tested and good, generator tested and good, regulator is tested and good, no drwa on batt with ignition off, Charging system putting out 13.5 VDC at 2000 rpm. At idle...

You've already spotted the problem. 13.5 volts is not enough to keep the battery charged. It will slowly lose it's charge. You should be charging at 14.5-15.0 volts.

Check your regulator output. Look just behind the base of the rear cylinder and you'll see the wires coming out of the primary that go to the regulator. There's a plug in the line somewhere. Unplug it. You'll be measuring the output of the alternator so you'll be dealing with the wire on the alternator end of the plug. There are two metal contacts in the plug. You'll need a DVOM (digital volt ohm meter) to do this test. Set the meter's function selector switch to AC VOLTS, 50 VOLTS or greater. Start the engine and bring it to a high idle. Insert one meter lead into each metal contact. It make no difference which lead goes where as you're measuring AC voltage. Your meter should read at least 25 volts or higher. If not, your stator is bad.

If you read 25 volts or more, your regulator needs replacing.

Good Luck

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So now we are back to beginning of my answer to you; the voltage regulator is failing and that is what is causing your lights to flicker.

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