Battery or Voltage Regulator
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Stage II
Joined: Jun 2022
Posts: 2
Likes: 0
From: Texas
Battery or Voltage Regulator
battery/voltage regulator I have an 2007 street glide,battery 5 years old put a meter on battery reading vary from 12-12.5 i start the engine to ssee if regulator is workin,battery stays at the 12s bad battery or bad voltage regulator any help could help me out Thanks battery light came on dash.
Last edited by Sambolito; Jun 23, 2022 at 11:39 AM.
Road Master
Joined: Nov 2009
Posts: 1,229
Likes: 417
From: Outer Banks, NC
Ok, if your battery's at 12.5 it sounds ok. (12 is too low).
If you start the engine and it still reads batt voltage your charging system isn't working. (you should see over 14)
I was lucky a few years ago and it turns out my regulator was bad (easy to replace). If your unlucky it may be your stator which is tuffer to replace.
If you start the engine and it still reads batt voltage your charging system isn't working. (you should see over 14)
I was lucky a few years ago and it turns out my regulator was bad (easy to replace). If your unlucky it may be your stator which is tuffer to replace.
Seasoned HDF Member
Joined: May 2012
Posts: 32,934
Likes: 36,032
From: Carlsbad, CA
There is a charging system diagnosis sticky at the top of the Electrical sub thread. That will enable you to properly diagnose the problem.
https://www.hdforums.com/forum/elect...ting-alarm-43/
https://www.hdforums.com/forum/elect...ting-alarm-43/
Last edited by TriGeezer; Jun 23, 2022 at 11:54 AM.
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,655
Likes: 6,455
From: Honah Lee
Make sure connection to battery is good first. If that doesn't fix it ..
With a five-year-old battery, start there with a new one. You have a problem and a bad battery will kill new parts.
Hook your maintenance charger to new battery for 24 hours. They come low usually. Then start it and with a good AC/DC/Ohm meter hooked to maintance plug.
Cranking should not drop below 9.6 DC shows plenty of reserve amperage. Running at 2000rpm or high idle, should read between 13.5 and 14.5 or so. Never over 15.
If it does not come up like that, turn it off. You should now have 12.7 or so. 12.3 is discharged. It will show a charge voltage till the headlights kill the surface charge when you first key on.
If it's not charging, you need to start at AC voltage before the regulator. If they are correct, it's the regulator. Those three 3 phrase wires should show no grounds with ohm meter. Running around 40 - 50 volts AC across them. (3 checks)
A lot of details were left out in that last sentence. See YouTube.
No real user check for regulator other then mentioned. It can vary. Probably always 13.5 minimum. Then if battery is 12.4 not running, it will show 14 charging.
PS . Make your next new post over in the new member area..
Welcome from North Beach, FL., USA!
Just in case you have not done this.
Add a Signature Line in your USER set up for your bike year, model, and all the letters that Harley recognizes it with so others see at the bottom of all your post. This enables others to know your exact model if you ever ask a question.
And an Avatar of your favorite shot in the USER set up for the small picture others will see in the top left corner of your post.
Your all set.... Enjoy the ride! ______________
With a five-year-old battery, start there with a new one. You have a problem and a bad battery will kill new parts.
Hook your maintenance charger to new battery for 24 hours. They come low usually. Then start it and with a good AC/DC/Ohm meter hooked to maintance plug.
Cranking should not drop below 9.6 DC shows plenty of reserve amperage. Running at 2000rpm or high idle, should read between 13.5 and 14.5 or so. Never over 15.
If it does not come up like that, turn it off. You should now have 12.7 or so. 12.3 is discharged. It will show a charge voltage till the headlights kill the surface charge when you first key on.
If it's not charging, you need to start at AC voltage before the regulator. If they are correct, it's the regulator. Those three 3 phrase wires should show no grounds with ohm meter. Running around 40 - 50 volts AC across them. (3 checks)
A lot of details were left out in that last sentence. See YouTube.
No real user check for regulator other then mentioned. It can vary. Probably always 13.5 minimum. Then if battery is 12.4 not running, it will show 14 charging.
PS . Make your next new post over in the new member area..
Welcome from North Beach, FL., USA!
Just in case you have not done this.
Add a Signature Line in your USER set up for your bike year, model, and all the letters that Harley recognizes it with so others see at the bottom of all your post. This enables others to know your exact model if you ever ask a question.
And an Avatar of your favorite shot in the USER set up for the small picture others will see in the top left corner of your post.
Your all set.... Enjoy the ride! ______________
Last edited by Jackie Paper; Jun 23, 2022 at 03:32 PM.
Stellar HDF Member
Joined: Sep 2021
Posts: 2,077
Likes: 1,498
From: Black Hills of SD
At 5 years old - Just consider it time, and get a new battery and use the above suggestions to troubleshoot. It is possible your battery has either so much sulfation or shorted plates that it cannot take a charge that the alt is putting out. But my guess from what you described points to the reg. But a good starting point would be the new battery. You got 5 years out of it - that's pretty decent. Some good info is suggested above.
Seasoned HDF Member
Joined: Aug 2007
Posts: 21,742
Likes: 17,591
From: Driftless Area
I stopped for an oil/filter change in the middle of a multi-state road trip.
The guy unplugged my stator to get at the filter, and didn't plug it back in.
I got about 12 miles down the road, and noticed my turn signals not working. I figured out the stator plug issue, and everything worked again. I only mention this because (for me,at least) the first indication the bike isn't charging is the turn signals not working.
The guy unplugged my stator to get at the filter, and didn't plug it back in.
I got about 12 miles down the road, and noticed my turn signals not working. I figured out the stator plug issue, and everything worked again. I only mention this because (for me,at least) the first indication the bike isn't charging is the turn signals not working.
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Stellar HDF Member
Joined: Sep 2021
Posts: 2,077
Likes: 1,498
From: Black Hills of SD
Excellent point. No power being generated to replenish what is used - these modern bikes and vehicles do not go very far before "things" start to act really funny.
One time on my Dodge truck. I was wrenching on something and lightly touched the wrench across the two Alt terminals, little spark - "no biggie". Well, the next morning, dark out, heading to work and the truck was about 2 miles form the house and I noticed the dash seemed to be dimming, then it seemed light the headlights were not the normal bright, about that second the truck - felt like it was not running right. Flip a bitch and head home! About 1/4 from the house the truck was really running bad and then just died... The power was sooooooo frinkin low it would not even power the door lock. Towed the truck how with an ATV and put that thing on a charger.
I managed to barely touch those two contacts on the Altenator and poop a 30 amp fuse. The truck ran about a title of 4 miles on battery only....The stupid fuse cost me about $12 bucks and was something I had to get at the dealer.
Why is so fun to say "Flip a Bitch" ??????? Oh, of coarse for the youngins that means making a fast U-turn and hauling azz....
One time on my Dodge truck. I was wrenching on something and lightly touched the wrench across the two Alt terminals, little spark - "no biggie". Well, the next morning, dark out, heading to work and the truck was about 2 miles form the house and I noticed the dash seemed to be dimming, then it seemed light the headlights were not the normal bright, about that second the truck - felt like it was not running right. Flip a bitch and head home! About 1/4 from the house the truck was really running bad and then just died... The power was sooooooo frinkin low it would not even power the door lock. Towed the truck how with an ATV and put that thing on a charger.
I managed to barely touch those two contacts on the Altenator and poop a 30 amp fuse. The truck ran about a title of 4 miles on battery only....The stupid fuse cost me about $12 bucks and was something I had to get at the dealer.
Why is so fun to say "Flip a Bitch" ??????? Oh, of coarse for the youngins that means making a fast U-turn and hauling azz....
Last edited by MarlinSpike; Jun 23, 2022 at 04:51 PM.
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Seasoned HDF Member
Joined: Mar 2021
Posts: 18,531
Likes: 3,743
From: backwoods
Even with a bad battery it should go up to around 14.4 dc when revved up. If at 12.5 off, for period of time battery is good enough for now.
I'd check ac out of stator. Should go around 100 bolts ac reved up. If that is good could be connections at vr.
I would not waste money on battery,cause you might be spending money elsewhere.
Also physically inspect VR.
I'd check ac out of stator. Should go around 100 bolts ac reved up. If that is good could be connections at vr.
I would not waste money on battery,cause you might be spending money elsewhere.
Also physically inspect VR.
