Voltage regulator?
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Stage III
Joined: Jun 2020
Posts: 3
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From: Nc
Voltage regulator?
I have a 2012 Sportster 1200c 9000 miles
I have a digital voltmeter on the handlebar.. it has always read 14.3 volts while running. The other day I rode to work at 14.3 volts just fine.
on the way home I noticed the volt reading was 12.3... it jumped up to 16 volts twice for a second but other than that stayed at 12.3
I came home put the bike on my trickle charger. Today I went for a ride it was at 14.3 volts for about a quarter-mile then drop back down to 12.3. I turned around and came home.
Does this sound like a bad voltage regulator?
I have a digital voltmeter on the handlebar.. it has always read 14.3 volts while running. The other day I rode to work at 14.3 volts just fine.
on the way home I noticed the volt reading was 12.3... it jumped up to 16 volts twice for a second but other than that stayed at 12.3
I came home put the bike on my trickle charger. Today I went for a ride it was at 14.3 volts for about a quarter-mile then drop back down to 12.3. I turned around and came home.
Does this sound like a bad voltage regulator?
Last edited by Volsrock 1; Jun 13, 2020 at 08:30 PM.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
True, but nor do you, yet! In the Tech Electrical section there are a couple of Stickies on checking your charging system. They will help you to diagnose what is causing your problem and hence what needs to be done to put things right. Let us know what you find before you start spending money!
Seasoned HDF Member
Joined: Sep 2017
Posts: 12,255
Likes: 4,947
From: England
Been out today and just catching up...
1:27 will be your computer's clock time which will be BST probably. America is at least 5 hours behind us.
https://www.timeanddate.com/worldclo...north-carolina
1:27 will be your computer's clock time which will be BST probably. America is at least 5 hours behind us.
https://www.timeanddate.com/worldclo...north-carolina
Last edited by Andy from Sandy; Jun 14, 2020 at 11:27 AM.
Thread Starter
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Stage III
Joined: Jun 2020
Posts: 3
Likes: 0
From: Nc
I charge battery it's at 12.5....started bike and ride it
It was at 14.5 for about half mile ..then dropped again to 12.5
It was at 14.5 for about half mile ..then dropped again to 12.5
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Seasoned HDF Member
Joined: Sep 2018
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From: Kalifornia
Not 100% sure on the sporty, but most regulators are grounded to the frame, in some fashion. If the mounting screws go into the frame, or maybe a wire to the frame, the connection might be loose or dirty. A missing or loose ground can cause erratic spikes of a regulator.
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Seasoned HDF Member
Joined: Sep 2017
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From: England
There is two ground points on the engine, engine case ground point and powertrain ground point. The regulator ground connects to the powertrain ground point which is on the left side behind starter on the transmission case.
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