Strange problem suggestions needed
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Cruiser
Joined: Jul 2011
Posts: 226
Likes: 4
From: Indiana
Strange problem suggestions needed
2012 Road King, rode to work yesterday morning was running fine. When I went to leave work, it seemed like it was running a little rough, It was a warm day, I was watching my ET on my power vision, it was a little high, nothing to be overly concerned with. Then the engine light and battery light came on, and the Temp rose about 10 degrees. Once I got across town both lights went off, temp slowly went down. When I got home I check errors on the power vision. It showed low voltage to front o2 sensor and to rear o2 sensor, a couple other low voltage and then low voltage Battery. I cleared all the codes. Put the tender on and it charged about 5 minutes, then went into standby/maintain mode. I started it up and it ran fine. I checked all the battery connections, and looked for any obvious chafed wires, everything looked good. Anything else I should check, or just ride it again Once the rain stops and see if it happens again.
Thread Starter
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Cruiser
Joined: Jul 2011
Posts: 226
Likes: 4
From: Indiana
Thanks for the reply, I was getting pretty low on gas, So I'll fill up and see if that makes any difference, Is it normal for the Voltage Regulator to go bad? Mine was replaced in 2012 and I have about 35000 miles on it.
Club Member
Joined: Sep 2010
Posts: 15,429
Likes: 7,123
From: Beyond Fucital
My recent problem, At the end of last season my starter sounded funny. I always put it on a tender because I don't know when I'll get to ride. So just short rides all last season.
Over the winter I did a stage 2 and was taking short rides again to see if I screwed anything up.
Anyway, I went out for a 120 mile ride on Saturday, stopped and stretched my legs. Bike wouldn't start, fortunately I had a jump pack. Road 60+ miles to get home. That's when I got to trouble shooting.
8.4 volts at the battery running or not, idle to 3k.
Checked stator voltage 1 idle to 3k @ 20 volts AC per k, I had 20-60 volts. So stator is good. Battery took a charge from the tender, Voltage regulator is bad.
Over the winter I did a stage 2 and was taking short rides again to see if I screwed anything up.
Anyway, I went out for a 120 mile ride on Saturday, stopped and stretched my legs. Bike wouldn't start, fortunately I had a jump pack. Road 60+ miles to get home. That's when I got to trouble shooting.
8.4 volts at the battery running or not, idle to 3k.
Checked stator voltage 1 idle to 3k @ 20 volts AC per k, I had 20-60 volts. So stator is good. Battery took a charge from the tender, Voltage regulator is bad.
Last edited by RANGER73; May 31, 2019 at 12:20 PM.
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Cruiser
Joined: Sep 2015
Posts: 225
Likes: 53
From: OHIO
I had a problem like this once, had a bad terminal in the connector from the stator to the VR that caused an intermitant charging problem . Check the 3 prong plug for corosion
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Road Warrior
Joined: Nov 2007
Posts: 1,800
Likes: 307
From: Houston, Texas
Voltage regulator failures can be common. I'm on my fourth at 138,000 miles but one was my fault from jump starting a completely drained battery. If you are getting low voltage, I would look at the stator. Usually, but not always, you get high voltage codes from a faulty regulator. Stator failure is low or now voltage. If it is the stator, change both it and the regulator.
Do you have a multimeter? If not, get one. The $10 ones at walmart will work good enough. There is a sticky here on the forum on how to troubleshoot stator and regulator. Also many video's on youtube.
Good luck.
Do you have a multimeter? If not, get one. The $10 ones at walmart will work good enough. There is a sticky here on the forum on how to troubleshoot stator and regulator. Also many video's on youtube.
Good luck.
