New Voltage Regulator
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New Member
Joined: Sep 2019
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From: West Virginia
New Voltage Regulator
I just replaced a bad voltage regulator on my 2007 Ultra. When I start the bike up it is running really fast. Is possible to plug the stator plug into the voltage regulator wrong and would that cause this issue? The new regulator is put out 14+ volts to the battery.
Seasoned HDF Member
Joined: Oct 2012
Posts: 11,217
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From: St.Louis Mo.
Do a throttle reset to it. Turn the switch on and off 3 or 4 times waiting at least 10 seconds between each cycle. On 10 seconds, off 10 seconds. Don't touch the throttle while doing this.
Manual says 3 seconds so try both ways.
Manual says 3 seconds so try both ways.
Last edited by hardheaded; Sep 20, 2024 at 12:17 PM.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
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From: San Diego, CA
The throttle by wire can learn a new idle position...
For example, if you turn off your bike with the kill switch, and you slightly turn your wrist when reaching for the kill switch, you may increase the throttle position a little bit right at the moment of shut down. The ECM will remember that position.
Do that like 10 times, and all of a sudden you realize your idle is at 1300-1400 rpm...
A throttle position reset, will zero the throttle position and the idle will go back to whatever the tune calls for...
You sometimes have to do the reset procedure a couple times for it to take...
OP-
There's no guarantee the throttle position reset will cure your issue. It is a good first step however, when trying to diagnose a high idle rpm. It has fixed many a high idle issue.
Give it a try and report back if it helped.
NOTE: I have heard to wait until the engine light shuts off, and I have heard to wait 10 seconds... Sorry, too lazy to make the walk to my garage and look it up..
Here is how I saved it in my notes;
Don't touch the throttle .. kill switch in the run position ...
Turn ignition switch on, wait for engine light to go off, turn ignition off.
Do this 4 times, then start the engine. This resets the computer.
Note: when shutting down the engine make sure it's at idle. Don't blip the throttle, and don't shut it down on cold idle. The computer remembers the last rpm at shutdown and sets the idle to that.
Last edited by hattitude; Sep 20, 2024 at 12:55 PM.
Seasoned HDF Member
Joined: Oct 2012
Posts: 11,217
Likes: 3,045
From: St.Louis Mo.
The service manual says 3 seconds between power up and down. Giving the bike time for the engine lights to go out would be a good try also. Try both ways and see what happens.
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Stellar HDF Member
Joined: Mar 2020
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From: West Coast
Idle reset sounds like a nice little April fools gag for your riding buddies.... just a thought
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Seasoned HDF Member
Joined: Jan 2011
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From: Michigan 15 Minutes East Of Hell
This is out of a 2009 manual ( TBW ) Not to sure if they were playing an April Fools joke or not
Place the engine run/stop switch in the RUN position and turn the
ignition/light keyswitch to IGNITION and then back to OFF four
times (without starting engine). Allow at least three seconds
to elapse between ignition cycles. As the ECM uses the first
four ignition cycles to establish the optimum idle speed, there
may be initial performance problems if the procedure is not
performed, such as high idle or hesitation when the throttle is
opened
Place the engine run/stop switch in the RUN position and turn the
ignition/light keyswitch to IGNITION and then back to OFF four
times (without starting engine). Allow at least three seconds
to elapse between ignition cycles. As the ECM uses the first
four ignition cycles to establish the optimum idle speed, there
may be initial performance problems if the procedure is not
performed, such as high idle or hesitation when the throttle is
opened
