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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I need a rectifier or avr for generac 3500 xl genarator

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    Put in new stator no power on red wire

    Did you check the rectifier/regulator? AC Power comes from the stator via the reg/rect which converts it to DC volts and sends it to the battery.

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    Diagram of 1994 zx7 electrical ststem

    Both the Regulator and the rectifier are behind the back plate inside of the Alternator, it should be 3 screws to take the back plate of the Alternator! But firstly you have to take the left hand side plastic off, from the fairing, there are roughly 6 or 7 screws and allen bolts, to take of to release the side panel, Hope this helps, :)

    Apr 20, 2013 | kawasaki Ninja Zx7r Zx9r '94 To '04

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    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.

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    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

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    1990 Suzuki GSX-R 750 L regulator/rectifier

    Hi, Sm_descartes the answer to this question is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
    For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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    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).
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    Mar 05, 2011 | 2005 Hyosung GT 250

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    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

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    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

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    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.

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