Question about Harley Davidson FLSTC Heritage Softail Classic Motorcycles

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How tobuild a new regulator/rectifier from accessory parts say from jay car

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  • Dick
    Dick May 11, 2010

    The parts you need won't be found just laying around. It's far cheaper to buy a new one than attempt to build a replacement.


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Hi how did you fair building your rec/reg box? I have been working on this for a week or so for a mate who has had 3 go faulty in 4000 miles.... I am in UK and have sourced the parts from 'Maplins' a UK high street electronics store.
I have used the single phase rectifier regulator schematic
I found this one on google. I have the circuit working at the 'breadboard stage' and I am going to 'rats nest' a protptype today.

Posted on Oct 16, 2012

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  • Harley Davidson Master
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I am not sure that you want to make one, the electronic units feature reduced voltage when the battery becomes fully charged, and that directly leads to longer battery life!

Posted on Sep 07, 2009

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How to wire a GY6 scooter regulator / rectifier and how it all ...

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Oct 28, 2009 - Uploaded by serpentza
How to wire a GY6 scooter regulator / rectifier and how it all works (Part 3 .... My scooter has no spark how to fix. gy6 chinese scooter 139qmb ...

Oct 28, 2015 | Motorcycles

1 Answer

1993 Vmax. Why is regulator/rectifier overheating?

You are not going to like this answer but here goes. All Motorcycles, mopeds, scooters, quads, etc, that have have a stator to regulator/rectifier to battery generating system all have the same design flaw. They all have lousey electrical connectors. Heres what happens: the stator produces 204-220 volt ac current. The same thing that will run an electric dryer in your home. It's a lot of power. That power gets changed to dc current by the recifier and converted into about 15 volts by the regulator in the same unit. That's a lot of heat energy. If at any time the electrical connections become compromised by vibration, oxidation, dampness, salt, or will see the wires fry. It's an over load...not a short. Power sports shops are well aware of this and are happy to charge you list price to replace the entire system for several hundred dollars. Usually between $800-$1000. You can get after market sets of the component parts and do it yourself and that's the only way I know of to avoid the cost & it still ain't cheap. Many moto-X riders replace the connectors with automotive plugs that seal out water, dust, etc with a recessed plug with a silicon gasket and seal it with dielectric grease to prevent oxidation. Like the plugs on a car's O2 sensors. Hope this has been helpful, Sorry to be the bearer of bad news.

Jul 31, 2015 | Yamaha Motorcycles

1 Answer

How to change rectifier for battery in bajaj spirit

Hi Anonymous, I am sorry you can't find the first and best tool you ever bought for your Bajaj but despair not for a mere $0 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
How to wire GY6 scooter regulator rectifier and how it all works Part 2...
How to wire GY6 scooter regulator rectifier and how it all works Part 1
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Jun 19, 2014 | Bajaj Spirit ES1 Motorcycles

1 Answer

My 99 xvl600 Honda transalp is overcharging the battery. I've tried changing thr reg/rect but it still boils battery?

A battery boiling dry is an indication that accessories have been added to the motorcycle incorrectly. If you add a radio or spotlights and attach the power wire directly to the battery, you bypass the voltage regulator/rectifier. The charging system can not regulate the charging system correctly and over charges the battery. If you want to add accessories you need to add them using a power wire past the regulator/rectifier so the charging system can properly regulate itself. Hope this helps.

Jul 28, 2011 | Honda XL 600 V Transalp Motorcycles

2 Answers


there is a regulator rectifier assembly that rectifies the ac coming from the stator and then regulates the voltage to both charge the battery and run accessories and lights....if you can obtain a voltmeter, try starting the bike and measure the voltage on the should be about 14V DC with the bike running...if not then switch the meter to AC and check the leads coming from the stator(they are the leads that come out from under the clutch cover)...the measured voltage from the stator should be around 30v AC and will go higher when you rev the engine....if this voltage is not present then the stator is defective...if it is then the rectifier/regulator is probably bad...also, make sure that all the fuses are good

Jun 11, 2011 | Yamaha SR 125 Motorcycles

2 Answers

Why is my batt not charging and when i jump it it conks out and its new bike

Well, my first response is that 2005 is not NEW. Hasn't been new for 6 years!
There's something wrong somewhere in the charging circuit.
Check your regulator module, and check the voltage coming from the alternator (magneto).
Make sure all the wires in the harness are connected properly and none of them are broken.

Mar 05, 2011 | 2005 Hyosung GT 250

1 Answer

2002 Yamaha XT 600 E. The bike lost power and cut out. Found battery extremly hot (possibaly over charged) I suspect that the voltage regulator/rectivier is faulty. Can any body tell me where the...

Hi, If you don't positive cable shorted to body, you are correct , the problem is on your alternator rectifier. You can not found anywhere the voltage regulator on your bike Except inside the alternator. You have to working hard to get your alternator out and fix the rectifier ( replace it of course). Good luck,
Regards, Jay

Mar 01, 2011 | 2003 Yamaha XT 600 E

2 Answers

Almost new battery has overheated and boiled over after a 100 mile ride

Either you have a bad regulator/rectifier or you hooked up an accessory (fog lights,radio,etc.) directly to the battery. Drawing power directly from the battery and not drawing it from a power wire past the regulator/rectifier causes the charging system to go hay wire and boil the battery dry. Never draw power directly from your battery. Always hook accessories to a hot wire on the motorcycle past the regulator/rectifier.

Aug 31, 2010 | Honda CB 400 Four Motorcycles

2 Answers

Why does my battery loose charge after a day sitting

There is a 99.99% chance the voltage regulator is bad and that is draining the battery. I'm not sure what else you are looking for, if you want to know how to replace it, etc.

If you do want to know how to replace it, I can tell you how but it would be far easier for you if you were to just take it to a shop.

Nov 17, 2009 | 1990 Honda VT 1100 C Shadow

2 Answers

Flat batery

The 2004 models have a problem with their generator stator.They have the light always on and the generator tries all the time to charge the battery in low rpm but is not enough so the regulator/rectifier fails, then the generator fails and of course the battery.You have to check the whole charging circuit and if you need to replace the generator stator purchase the 2005 part.It fits and it is improved.New regulator/rectifier and of course new battery.After you have finished install a small switch somewhere at the upper side of your front forks so that you can switch off the lights when ever you can.

Apr 06, 2009 | 2004 Honda CBR 1000 RR Fireblade

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