Question about Harley Davidson FLHTCUI Electra Glide Ultra Classic Motorcycles

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1998 Ultra Classic voltage regulator has two wires one with a yellow and one with the black where do those wires go

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Hi, Francisstossel the black wire goes to a good and clean ground the yellow tabbed wire goes to the main circuit breaker silver post also what you need is a wiring diagram that is in the back of your service manual if you can't find the first and best tool you ever bought for your Harley, despair not, for a mere zero $ you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below and for more specific information and questions at no charge please feel free to contact me at Good luck and have a nice day.,flhtc,flhtc_ultra,fltr1,.jpg
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Posted on Dec 01, 2016


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Posted on Jan 02, 2017

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SOURCE: wire connector between stator & voltage reg/rectifier burnt

your voltage/reg. can be tested in a couple different ways check ground res. check res. then revs. bias on diodes you have ac in dc out it sounds like you may have a diode gone bad allowing ac curent to flow causing the wires to get hot

Posted on Jul 31, 2009

  • 89 Answers

SOURCE: honda cb250w 1998 problem with regulator

The three yellow wires are from the alternator and supply AC voltage. The green should go to earth. The red and white is the 12 volt DC that will go to the starter solenoid/battery connection.

Posted on Jan 30, 2010

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SOURCE: 2002 FLHTCUI Electra Glide Ultra Classic: What's approx. cost for a stator / regulator repla...

HD = Hundred Dollars, voltage regulator.
Stator replacement = big dollars because labor intensive. The part is around $100, maybe more by now


Posted on May 17, 2010

  • 8909 Answers

SOURCE: My 2001 honda cbr 929

Replace the voltage regulator before it kills the rest of the system.

Posted on Mar 21, 2011

  • 4565 Answers

SOURCE: i need to change the

First disconnect the battery negative post. Then, unplug the two wires that run from the regulator to the front part of the engine. Follow the remaining wire from the regulator to the either the battery positive post or to the starter connection and disconnect that wire. Remember how it was routed through the engine and frame area. Unbolt the regulator and bolt the new replacement back up in it's place. There may be a "star type" lock washer between the regulator and the frame on all the mounting bolts. Put his washer back on or in the case there isn't one, put one on each mounting bolt. The purpose of this is to ensure the regulator has a good ground. If if doesn't have a good ground, it will not work correctly. Plug the plug from the regulator into the socket on the front of the engine and run the remaining long wire along the frame and back to where the original wire came from, either the battery positive post or the starter connection. Some people cut the original wire and splice in the new wire from the new regulator but I don't recommend it. It's a problem waiting to happen. Reconnect the battery negative post. When working with a battery, always disconnect the negative post first and reconnect the negative last. This prevents damage to the battery or motorcycle and possibly prevents injury to you due to arcing the battery against the frame ground.

Good Luck

Posted on Jun 07, 2011

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2001 Ultra Classic Battery went bad had to jump it quit charging. have a new battery now only shows 10-12 volts on the meter tried a different regulator with same results. tried to check stater with...

usually it is either the regulator or stator that dies
firstly check stator...(alternator)...set multi mtr at 500ac volts
connect probes (red/blk) to both wires from stator..output voltage should read between 100 acv mid revs to 150 acv mid revs
output to battery should be 13.5v -14.75v dc...if not then regulator is RS ...I used to fit Honda regulators 30amp type with 2 red and 2 green wires ..because it is a 3 phase regulator just disconnect one yellow wire
harley regulators are of poor quality...they have no on off switch like the japanese ones other words when you turn off your ignition the harley regulator is still on
hope this helps

Mar 08, 2015 | 2001 Harley Davidson FLHTCUI Electra Glide...

1 Answer

How do I replace the voltage regulator on an ultra classic harley davidson

Voltage regulator on an Ultra Classic is "plug and play"......usually located on the front of the frame for airflow....simply follow the wire to the left side primary and unplug it from the stator plug which is in the case. Unbolt the the regulator and replace with a new one...coat the plug with dielectric grease to stop moisture and your done.


Feb 10, 2015 | Harley Davidson FLHTCUI Electra Glide...

1 Answer

Were to put brake fluid for rear brake on 1991 ultra classic tour glide

Hi Anonymous, there is a black plastic reservoir in between the front frame downtubes just above the voltage regulator. Have nice day.

Sep 12, 2012 | 2004 Harley Davidson FLHTCUI Electra Glide...

1 Answer

I have an 01 ultra classic I just installed a new stator but I didnt mark the wires before removing them from the plug. does it matter which wire goes in which side of the plug?

You stator output is an AC voltage that is rectified by the regulator turning it into a DC voltage to charge the battery. I am not familiar with the later model bikes with the Twin Cam engines. However. if there are only two wires in the plug that plugs to the stator, it does not make any difference which wire goes where into the plug. The only wire that does make a difference is the wire that goes to the battery with is the DC output of the regulator. Usually that wire is a larger diameter wire due to the larger gauge wire and heavier insulation on it.

Good Luck

Jul 29, 2011 | 2001 Harley Davidson FLHTCUI Electra Glide...

1 Answer

2002 FLHTCUI Electra Glide Ultra Classic: What's approx. cost for a stator / regulator repla...

HD = Hundred Dollars, voltage regulator.
Stator replacement = big dollars because labor intensive. The part is around $100, maybe more by now


May 15, 2010 | 2002 Harley Davidson FLHTCUI Electra Glide...

1 Answer

Two years ago my Voltage Regulator went bad and over-charged my new battery to the point that it swelled up. The Yamaha dealership replaced both the battery and Voltage Regulator. Two years, almost to the...

If you're going through regulators that often I would suggest going after the stator. Make sure it's not grounding out on the chassis. Find the 3 yellow or white wires that are connected to the regulator. using a meter in OHMS ( looks like the horseshoe ) with the bike off check wire one (red ) to wire 2 ( black ) then wire one ( red ) to 3 (black ), then 2 (red ) to 1 ( black ) and 2 ( red ) to 3 ( black ) , then pick one ( red ) and black to the chassis, motor, ground. somewhere metal on the bike. The first series of tests you should get some sort of numbers, ( which should be somewhat close in numbers ) When you go to ground, Chassis you should get no numbers, OFL, OL, or the horseshoe sign if you get numbers there, the stator is bad and your transmitting ac voltage to the chassis.

Aug 27, 2009 | 2000 Yamaha V Star 1100 Classic

1 Answer

Need main wiring schematic for 2000 ultra classic speedo,speedo reset ,tacho, wiring wires got pulled out of plugs need help.thank you

Looking at the plugs on the meter side of the harness: for the speedometer there is a three position plug. Pin #1 is Orange, Pin #2 is White/Green and Pin #3 is Black. for the Tachometer there is a six position plug, Pin #1 is Orange, Pin #2 is Pink, Pin #3 is Black/Yellow, Pin #4 is Green/Red, Pin #5 is Yellow/Red, Pin #6 is Black

Jul 19, 2009 | 2000 Harley Davidson FLHTCUI Electra Glide...

1 Answer

Battery dies while running, generator check and tested good, however the key switch tumblers are trashed. does the key switch have anything to do with this?

Hi and welcome to FixYa,

On most versions, the output of the voltage regulator (white wire) is directly feed to the battery's + terminal through the main 30 Amps fuse in the starter relay. However, the regulator needs a switched +12 (usually brown wire) to go active which is fed fron the IGN switch. The other wires of the regulator are 3 yellow wires from the stator and a black / yellow to ground.

Good luck and thank you for asking FixYa.

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