Question about Yamaha Road Star Motorcycles

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1999 yamaha roadstar battery will not charge even thought it is only 2 weeks old and a new regulator rectifier was installed 2 days ago. what else can I look for

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Test if voltage coming to battery is dc.Check coil output voltage,sometimes there might be a loose or corrupted wire.check all fuse to battery,also clean all connection of ground and live battery from and to battery.Now have you added the battery required acidity and amount of liquid? Battery needs a drain to allow overflow, is that not blocked?

Posted on Jul 11, 2009

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Posted on Jan 02, 2017

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1 Answer

On a 2000 Yamaha YZF r1, I just put in all OEM parts a new battery Stator and rectifier And at idle it only charges at 12.25 What do I do now


Hi, Cody what is the voltage at 3,000 RPM? check regulator ground for clean tight connection sorry you can't find the first and best tool you ever bought for your Yamaha despair not, for a mere $10 you can download another one. For more information about your issue and free valuable downloads that you will need please visit the websites below. Good luck and have a nice day.
http://www.r1-forum.com/forums/103-02-03-r1-mechanical-help/185605-battery-stator-rectifier-regulator-issue.html
How to diagnose R1 charging system R1 ZONE com
2007 2008 Yamaha r1 STATOR FAULT not charging Regulator Rectifier location...
http://www.yamaha-motor.com/assets/service/manuals/2001/lit-11626-14-35_76.pdf
2000 2001 Yamaha YZF R1 Service Manual R1 Moto Data Project

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Mar 01, 2016 | Yamaha Motorcycles

1 Answer

Why do three white wires keep melting. also is there suppose to be two grounds from motor to battery.


Hi, Tyler your regulator needs to have a tight clean ground for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.r6-forum.com/forums/57-garage-mechanical-help/15634-rectifier-regulator-failure-twice.html
melted rectifier wires again
1999 2002 Yamaha YZF R6 Service Manual R6 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

May 28, 2014 | 2000 Yamaha YZF-R6

1 Answer

89 virago 750 eats new batteries


The bike probably has a faulty charging system. Need to check regulator/rectifier for proper operation as well as the stator's output voltage on all 3 phases. They usually blow out the regulator though.

Oct 23, 2012 | Yamaha Motorcycles

1 Answer

Battery on 1999 r1 wont charge, changed battery and rectifier still not charging


Hi, Anonymous you may have a faulty alternator in order to check out any main electrical system, you have to start with a fully charged battery 12.5 volts or better, and be able to pass a load test if necessary. "WARNING" never plug or unplug any electrical connector with the engine running !!!
1. Check battery terminals for damage or corrosion, check battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
2. Check the voltage drop at the battery when you hit the starter button, anything below 9 volts you might have a faulty battery.
3. Check voltage at the battery with the bike running at 3,600 RPM should be 14.3 to 14.7 volts. If you are not getting these numbers, you might have a faulty voltage regulator.
4. Make sure voltage regulator is "GROUNDED" and functioning properly, watch the video below on how to test a voltage regulator.
5. Unplug the connector to the alternator and hook your multimeter leads to the alternator (pin/socket selection does not matter) set the multimeter to AC volts, at an idle the multimeter should read 16 to 20 volts AC. at 2,000 RPM 32 to 40 AC volts, 3,000 RPM 48 to 60 AC volts. If you are not getting these numbers, you may have a faulty rotor, follow step 6
6. Set the multimeter to OHM'S, connect one lead to the alternator (any pin/socket) and the other to a ground, the multimeter should read infinity. Connect both leads to the alternator multimeter should read 0.1 to 0.2 OHM'S. If you are not getting these numbers, you have a bad stator.
7. Check all wiring in the charging circuit for worn or chaffed spots and all wiring connectors in the circuit for corroded, broken, or loose pins/sockets, which is the # 1 offender.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://www.r1-forum.com/forums/103-02-03-r1-mechanical-help/185605-battery-stator-rectifier-regulator-issue.html
2007 2008 Yamaha r1 STATOR FAULT not charging Regulator Rectifier location...
1998 1999 Yamaha YZF R1 Service Manual R1 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Oct 06, 2012 | 1998 Yamaha YZF-R1

1 Answer

2001 yamaha yzf r1 i installed a new battery. it does not stay charged and the bike stalls. Noticed the red wire to the rectifier and regulator assembly over heated trying to find the main source of the...


Hi, Gobrickconst in order to check out any main electrical system, you have to start with a fully charged battery 12.5 volts or better, and be able to pass a load test if necessary. "WARNING" never plug or unplug any electrical connector with the engine running !!!
1. Check battery terminals for damage or corrosion, check battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
2. Check the voltage drop at the battery when you hit the starter button, anything below 9 volts you might have a faulty battery.
3. Check voltage at the battery with the bike running at 3,600 RPM should be 14.3 to 14.7 volts. If you are not getting these numbers, you might have a faulty voltage regulator.
4. Make sure voltage regulator is "GROUNDED" and functioning properly, watch the video below on how to test a voltage regulator.
5. Unplug the connector to the alternator and hook your multimeter leads to the alternator (pin/socket selection does not matter) set the multimeter to AC volts, at an idle the multimeter should read 16 to 20 volts AC. at 2,000 RPM 32 to 40 AC volts, 3,000 RPM 48 to 60 AC volts. If you are not getting these numbers, you may have a faulty rotor, follow step 6
6. Set the multimeter to OHM'S, connect one lead to the alternator (any pin/socket) and the other to a ground, the multimeter should read infinity. Connect both leads to the alternator multimeter should read 0.1 to 0.2 OHM'S. If you are not getting these numbers, you have a bad stator.
7. Check all wiring in the charging circuit for worn or chaffed spots and all wiring connectors in the circuit for corroded, broken, or loose pins/sockets, which is the # 1 offender.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
bike wont hold charge killed new battery Yamaha R1 Forum YZF R1 Forums
2007 2008 Yamaha r1 STATOR FAULT not charging Regulator Rectifier location...
https://www.electrosport.com/media/pdf/fault-finding-diagram.pdf
1999 2002 Yamaha YZF R6 Service Manual R6 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Apr 24, 2011 | 2001 Yamaha YZF-R6

1 Answer

My xt125r battery wont hold a charge for more than a couple of days.do you think its the rectifier?please help


Remove the battery from the bike ( or at least remove the positive cable ). Charge the battery but make sure water covers the top of the plates in each cell. When charged, disconnect the charger and let the battery sit for two or three days with the red positive wire still disconnected. Now re-connect the red wire and see if the battery is discharged when 2 or 3 days have passed. If so, get a new battery. The batteries only last 1.5 to 2 years. How old is your battery? If the battery DOES have full power after the 2 or 3 days mentioned, start the bike and check the voltage across the battery terminals while running the engine at about 2000 rpm. The voltage should read around 14 volts. If not, there is a problem with the stator, regulator or rectifier. If your voltmeter does show 14 volts or so, and the battery still drains in 2 or 3 days, You will have to find what is draining it. Abraded wire grounding on the frame? Bad switch? Please rate my answer. Thanks.

Apr 16, 2011 | 2006 Yamaha XT 125 R

4 Answers

Bike not charging


Sounds like regulator/rectifier, stator, or charging rotor.

Mar 08, 2009 | 2001 Yamaha V-Max

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