Question about 2008 Yamaha YZF-R125

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How a motorcycle rectifiers works?

Im just wondering how is a rectifier for motorcycles works?

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On many bikes a rectifier is similar to the attached photo. alternating current(AC) is produced by the flywheel and stator, which is put though a series of 6 diodes, to allow electrons to flow one way only.
Producing DC current, to charge the battery. This DC current must also be put through a regulator, so the battery doesnt overcharge.




how a motorcycle rectifiers works? - e6f0595.jpg

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

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Hi, Peter this is Q&A website we answer motorcycle issue questions we do not sell parts or services. Please contact your local dealership or reputable repair shop for parts inquiries or go online for a parts supplier.
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I have a 2001 sportster 883. The battery keeps getting drained and wont charge while driving. i already put a new battery in it and was wondering if there was a common trend with this.


If you are not charging, I suggest you look at one of two things: (1) is the rectifier not working (changes AC from your alternator into "rectified" DC) or (2) the alternator is not producing power for some reason.

Alternators cannot make power unless you first put power into the device, BTW.

Before you purchase another battery and/or get stranded, please have your motorcycle looked at by a professional at your local HD Repair Shop.

Thanks for your question @ FixYa.com

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you will know if the regulator/rectifier goes, if 1, all your lights go much brighter and blow when you rev the bike, or 2, if your battery is not charging. a simple test is to check the voltage at the battery with engine idling, should be about 14volts. There is nothing you can do to prevent the rectifier from going.

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I have a 1991 ninja 600 and the charging system isnt working what could it be


Check the rectifier. Power should flow in only one direction.

Check the regulator. works?

Is the alternator putting out?

Is the battery fully charged?

Im leaning toward a shorted rectifier.

If you need help with this, please comment to this post.

a

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