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Voltage Regulator or Battery?

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Old Sep 8th, 2009, 01:16 AM     #1
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Voltage Regulator or Battery?

I have a 07 street bob and was wanting to know exactly what the voltage regulator does....I went to start my bike and it turned over once and all power shut off. I got a jump start and was riding home and power was cutting out and kicking back on, making the bike obviously to jump a little. Any suggestions on what might be the problem? Im hoping not a short...
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Old Sep 8th, 2009, 05:26 AM     #2
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Re: Voltage Regulator or Battery?

Quote: Originally Posted by Pride913 View Post
I have a 07 street bob and was wanting to know exactly what the voltage regulator does....I went to start my bike and it turned over once and all power shut off. I got a jump start and was riding home and power was cutting out and kicking back on, making the bike obviously to jump a little. Any suggestions on what might be the problem? Im hoping not a short...
First thing to do is check for clean, tight, and good connections at both ends of the positive and hegative battery cables.

Lots and lots
have experienced the same symptoms as you and found loose battery connections.
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Old Sep 8th, 2009, 06:57 AM     #3
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Re: Voltage Regulator or Battery?

I agree with the battery terminals in need of cleaning and tightening.
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Old Sep 8th, 2009, 09:46 AM     #4
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Re: Voltage Regulator or Battery?

Quote: Originally Posted by Pride913 View Post
I have a 07 street bob and was wanting to know exactly what the voltage regulator does....
The voltage regulator actually does 2 major jobs. The 1st job: Since the output voltage level of the stator windings is dependent on the velocity or speed of the permanent magnets, the output voltage level of the stator is dependent on the RPM of the engine. Since we want to charge our battery to a specific level or voltage we must "regulate" or control the output of the stator to a relatively flat voltage level. A lead acid battery has a nominal output voltage of 2.1 volts. What we call a "battery" is actually 6 small batteries in series. It is 6 cells X 2.1 volts or 12.6 volts. This battery likes to be charged with an electrical force of 13.8 volts.
The stator in the bike has a native unregulated output of something between 0 volts (0 RPM) to maybe 25 volts (4000 RPM). It may even be higher, because I have never checked it. The "Regulator" regulates the output of the stator to more or less the 13.8 volts that the entire electrical system was to designed to run at.
The 2nd Job:
The output of the stator is an AC voltage which can not be used to charge a DC battery. The negative component of the AC output must be sliced off and sent to the Negative terminal of the battery. The postive component of the AC stator must be sliced off and sent only to the postive terminal of the battery. Solid state Rectifiers are used to perform this operation. The rectifiers that do this, happen to be enclosed inside the voltage regulator case. Even though the rectifiers really have nothing to do with voltage regulation, they are packaged together with the Voltage regulator.
So even though your voltage regulator may be Good, you can have a blown rectifier which will require you to replace the voltage regulator unit. Actually the voltage regulator should have been called a Regulator/Bridge assembly instead of just a voltage regulator because it does both.

By its very nature, voltage regulation & voltage rectification will generate lots of heat. That is why you see
voltage regulator/rectifiers with large heat fins on them. Not being able to get rid of rectification heat is what kills most units.

Hope this helps, Hoople

Last edited by Hoople; Sep 8th, 2009 at 09:51 AM.
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Old Sep 8th, 2009, 09:49 AM     #5
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Re: Voltage Regulator or Battery?

Excellent explanation Hoople
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Old Sep 8th, 2009, 09:55 AM     #6
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Re: Voltage Regulator or Battery?

Glider,

Thanks. I am just trying to build up my posts so I can download the manual and REALLY learn something!
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Old Sep 8th, 2009, 09:56 AM     #7
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Re: Voltage Regulator or Battery?

Proper way of going about it too.
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Old Sep 8th, 2009, 11:53 AM     #8
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Re: Voltage Regulator or Battery?

Quote: Originally Posted by glider View Post
I agree with the battery terminals in need of cleaning and tightening.
HEY RIGHT UP MY ALLEY.......

ON a 07 soft tail REMEMBER my gal friend had the SAME PROBLEM.....

HARLEY has a repair for free(recall or service bulletin by HD out on this problem 07).... BAD or crimpted WIRES - HARNESS issue .... they NEED bike in FIRST and ONLY THEN will order the parts needed for a NO $$$$$$ cost to you repair...nothing over the phone will speed this up.... TRUST ME>>>>

My friend got stranded 2 by the road side.... Harley came n got her spent 4 or so days b-4 the service manager said anything about a service bulletin or recall...... SO save time and TELL THEM about the HD bulletin.....

signed....bubbie
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Old Sep 8th, 2009, 05:44 PM     #9
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Re: Voltage Regulator or Battery?

Quote: Originally Posted by glider View Post
Excellent explanation Hoople
+1 welll done
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Old Sep 8th, 2009, 05:58 PM     #10
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Re: Voltage Regulator or Battery?

Quote: Originally Posted by Hoople View Post
Glider,

Thanks. I am just trying to build up my posts so I can download the manual and REALLY learn something!
We can down load a manual here????? Tell me how!
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