2009 ultra classic regulator issues…
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Stage II
Joined: Dec 2021
Posts: 2
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From: Cedar City, Utah
2009 ultra classic regulator issues…
After I’ve cranked up and maybe the bike has been running for a few minutes, or maybe I’ve started the ride, the regulator will drop out: I will see the voltage meter reading maybe 11 votes, and then the battery light and check engine light will come on. This may resolve itself during a short ride, maybe a rev of the engine but not always, and then it comes back to normal and the lights go back to normal. I haven’t tested the regulator or stater yet, but it sure sounds like the regulator. Does anyone have comments regarding the RMSTATOR for a replacement?
Club Member
Joined: Apr 2013
Posts: 5,873
Likes: 3,850
From: Cape Cod
I'd say its the Voltage Regulator, and check out CYCLE ELECTRIC(https://www.cycleelectricinc.com/) for a replacement.
But check your Factory Service Manual to find the exact way to check it.
But check your Factory Service Manual to find the exact way to check it.
Seasoned HDF Member
Joined: Mar 2021
Posts: 18,460
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From: backwoods
Could be stator if producing low voltage.. some years it is easy to get to plug between volt reg and stator, some years tougher.
Rev it up until you get 80-100 volts AC. 20 ish per 1k rpm.
Rev it up until you get 80-100 volts AC. 20 ish per 1k rpm.
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Joined: Dec 2005
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From: poway
I'd suspect it's either the regulator giving up or the stator has a random short to ground. Testing the stator since it is random, will likely pass. I'd suspect that if the issue occurs and goes away that it might be something loose in the regulator.. I'd give more credence to the stator if it failed at temp and stayed that way. Still it could be either one. If you don't want to screw with it, replace both.
Seasoned HDF Member
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From: backwoods
I'd suspect it's either the regulator giving up or the stator has a random short to ground. Testing the stator since it is random, will likely pass. I'd suspect that if the issue occurs and goes away that it might be something loose in the regulator.. I'd give more credence to the stator if it failed at temp and stayed that way. Still it could be either one. If you don't want to screw with it, replace both.
But they are 16 year old parts.
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Joined: Feb 2007
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From:
Diagnostics would be needed in order to avoid purchase of new parts that might confuse diagnostics even more.
Could be something simple like a loose cable to or from battery.
Check the 4 battery cable ends.. At battery terminal and the other ends.
Check stator connectors and regulator connectors.
A load test of battery is FREE at many auto parts.
A simple digital voltage meter can be used to run some simple tests of Regulator & Stator too....could perform simple load test with the same meter also by looking at voltage while cranking.
Could be something simple like a loose cable to or from battery.
Check the 4 battery cable ends.. At battery terminal and the other ends.
Check stator connectors and regulator connectors.
A load test of battery is FREE at many auto parts.
A simple digital voltage meter can be used to run some simple tests of Regulator & Stator too....could perform simple load test with the same meter also by looking at voltage while cranking.
Cruiser
Joined: Jul 2023
Posts: 132
Likes: 42
From: South Carolina
After I’ve cranked up and maybe the bike has been running for a few minutes, or maybe I’ve started the ride, the regulator will drop out: I will see the voltage meter reading maybe 11 votes, and then the battery light and check engine light will come on. This may resolve itself during a short ride, maybe a rev of the engine but not always, and then it comes back to normal and the lights go back to normal. I haven’t tested the regulator or stater yet, but it sure sounds like the regulator. Does anyone have comments regarding the RMSTATOR for a replacement?
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Stage II
Joined: Dec 2021
Posts: 2
Likes: 1
From: Cedar City, Utah
Found the problem!
The problem on my FLHTCU of my charging system cutting out unpredictably turned out to be the connection where the wire plugs into the primary case to the stator. I started to go for a ride a couple of days ago, and the problem happened just shortly after start up. I got off the bike, reached down and wiggled that connection and the problem immediately went away. Since that time, I have ridden the bike several times without any issues. I still need to pull that connection and clean it up good, but the previous owner put a ton of chrome on this bike, which makes some things hard to get at.
My sincere thanks to all of the individuals who replied to my question. One person had suggested that it might just be a dirty connection, and that’s what it was.
My sincere thanks to all of the individuals who replied to my question. One person had suggested that it might just be a dirty connection, and that’s what it was.
Last edited by AlfredPruett; Aug 16, 2025 at 11:19 AM.
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Seasoned HDF Member
Joined: Mar 2021
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From: backwoods
If it the wire that goes into engine I think you are going to need to replace stator it's replaceable
Previous owner put a chrome cover on inner primary. Had leak on cylinder and didn't see it. Plus it's simply fake
Previous owner put a chrome cover on inner primary. Had leak on cylinder and didn't see it. Plus it's simply fake
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Joined: Mar 2021
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From: backwoods
typo. The grommet is not replaceable
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