Question about 2009 Yamaha WR450F

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I have a 2010 yamaha wr450 f and the horn wont work nor will the high beem indicater or the blinker indicater have checked all conections earth points , globes and still nothing . ihave the motor running while im checking all this as nothing works with just the ignition on . can you help me thanks mark

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  • Yamaha Master
  • 41,623 Answers

Hi, Mark if you have a dash or instrument light that is out and you have confirmed that the bulb is good then you need to do some quick diagnostics all you need is a test light and a wiring diagram usually found in the back of your service or owners manual.
1. Make sure your battery is fully charged with "CLEAN" and "TIGHT" connections and the instrument light fuse is not blown.
2. Inspect the bulb socket for corrosion and clean as necessary, a spray can of electrical contact cleaner and compressed air works the best.
3. Confirm your test light is working properly by connecting one end to the battery negative post and touching battery positive post with the sharp probe, the test light should illuminate.
4. With the ignition turned on confirm you have power to the bulb socket by connecting your test light to battery negative or ground and probe the center contact, the test light should illuminate if not you need to check the integrity of the switch or sending unit the light represents, if that is ok then you have a short in the wiring between the component and the light bulb, if all is ok proceed to the next step.
5. Confirm you have a good ground to the light bulb socket by connecting the test light to battery positive and probe any metal part of the socket housing, the test light should illuminate, if not you need to find the short and repair as necessary.
6. Inspect the integrity of the spring loaded positive contact insulation tab by pushing against it with your test light to see if it goes down and springs back fully to it's operating position again contact cleaner and compressed air works best to restore proper function.
7. If your bike has a lot of mileage the vibration can cause bulbs to become loose in the socket by wearing down the soldered contact thus loosing spring pressure from the tab and eventually stop making contact this can be fixed by replacing the bulb or putting a drop of solder on the worn out end to ensure contact.
8. If all of your dash lights are out but are good then you most likely have a faulty connection to the dash wiring harness, inspect the connector for corroded, broken, or loose pins/sockets.
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.
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Yamaha WR450F 2009 Owner Service Manual
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Yamaha wr450fb Owner Manual

Posted on Feb 04, 2017

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Posted on Jan 02, 2017

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Adrian762
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SOURCE: ive got a 2008 wr450. the head light and blinkers

Go to this site and get a manual, it will give you the wiring diags etc and make your job much easier. I looked it up on my bikes manual and these items are on different fuse lines so I am buggered too. You may have some poor earths, that could cause your problem.

http://www.yamaha-motor.com/sport/myyamaha/prompt/L3Nwb3J0L3NlcnZpY2Uvdmlld21hbnVhbHMvdmlld21hbnVhbHMuYXNweD9scz1zcG9ydA==/Owners%20Manual/starthere.aspx

Posted on Feb 17, 2010

  • 2 Answers

SOURCE: blinkers,horn+brake light wont work.have checked

REPLACED BLINKER RELAY.HORN+BRAKE LIGHT-ONLY WORK IF MOTOR IS RUNNING.

Posted on Feb 17, 2010

  • 11 Answers

SOURCE: Blinkers dont work

Have you tested the switch for power with a test light?

Posted on Apr 10, 2010

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