Bad voltage regulator?!
Bad voltage regulator?!
I was having issues with my cel coming on and off and losing power to my dash altogether. I used the dtc process and found out it was throwing P0563 battery voltage high efi. Took it to the dealer as im still under my 1000 mile warranty and they said my negative terminal was a little loose so they tightened it and cleared the code. Its throwing the same code today minus losing power to my dash. I overheard the tech at the dealer say the alternator was not overcharging which im assuming is a good thing. Im just at a loss on what else it could be besides the voltage regulator? Any help is greatly appreciated.
Cruiser
Joined: Feb 2008
Posts: 102
Likes: 0
From: GA
To check voltage regulator, 1st make sure battery has a full charge to crank bike. Put a voltmeter across battery terminals when bike is running. Slowly rev motor. Voltmeter should show an increase up to 14V to 14.5V. If voltmeter is not moving or it's reading way above 14V, then voltage regulator is bad.
Cruiser
Joined: Feb 2008
Posts: 102
Likes: 0
From: GA
Sounds like a bad voltage regulator. After a full battery charge and you ride the bike for let's say a few hours then put it up for a day or so and you try to crank it and it does have enough juice to start the motor but the headlight is pretty bright, it probably is the voltage regulator. VR is not controlling the voltage provided from the stator.
Trending Topics
Road Captain
Joined: Aug 2008
Posts: 541
Likes: 56
From: Bayou State
I have a 2012 Heritage and the voltage regulator has been changed twice while under warranty. Mine was on the recall list.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Road Captain
Joined: Oct 2009
Posts: 728
Likes: 0
From: So Cal
Hello and Happy Holidays!
Last night my instrument panel lights started shutting on and off - bike was running fine.
DTCs read: P0563/b0563 (Battery Voltage High) and b1006/b1007 (Line Overvoltage Instruments).
Put a volt meter to battery - reads 17 volts when revving the engine.
Question 1: Could the problem be anything OTHER THAN the regulator?
Question 2: Does anyone recommend any of the aftermarket regs (Accel, Volt Tech, Drag Spec, etc.) over the OEM Harley part?
Thanks for any advice,
KK
Last night my instrument panel lights started shutting on and off - bike was running fine.
DTCs read: P0563/b0563 (Battery Voltage High) and b1006/b1007 (Line Overvoltage Instruments).
Put a volt meter to battery - reads 17 volts when revving the engine.
Question 1: Could the problem be anything OTHER THAN the regulator?
Question 2: Does anyone recommend any of the aftermarket regs (Accel, Volt Tech, Drag Spec, etc.) over the OEM Harley part?
Thanks for any advice,
KK
Road Captain
Joined: Apr 2013
Posts: 583
Likes: 4
From: australia
at 17 volts that is way too much, around 14 is where its suppose too be.. also at them volts check your battery for fluid/acid as that can lead too the battery getting too hot and boiling the acid, stuffing the battery.. voltage 13.8 to 14 when checked.. IT also could be a loose earth some where or your instruments causing the issue .