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I have a 1972 yamaha ls2 100 cc twin when I rev the bike it blows out any light that is on. It appears to be the voltage regulator but I can't find one on this bike. Does the bike have a voltage regulator? If so where. Any ideas what will cause this if not the V/R?

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Have you tested the voltage at the battery while the bike is running? you should check twice once at idle and once at the point where your lights are popping. if your battery is getting more than 14v then its possible your stater is going out or needs to be adjusted. im not very familiar with that bike but that's where I would start looking. also test your rectifier make sure its working to spec.

Posted on Aug 02, 2013

Testimonial: "I have tested the voltage at the battery, 8 volts at idle and 18+ volts at higher RPM. How do I test the stator and rectifier? "

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Posted on Jan 02, 2017

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  • 2336 Answers

SOURCE: bad regulator?

Fuse 2 is actually the fuse from the regulator to the battery (see schematic below) - so if it's blown then you are not charging the battery. Put the correct fuse in - if it blows again, you may have a shorted regulator. Unplug both connections to the regulator: With your test meter set to 'ohms' check in turn between each of the three yellow wires in the 3-pin connector to both the red & blacks in the 4 pin connector (the two reds are already connected to each other, as are the two blacks). Also check between the reds & the blacks. None of these should readings be 'short' (zero ohms). Inspect the wiring at the three-pin connector - if the bike's harness looks charred/burned that is a sign the regulator has shorted. There is possibility it could have taken the stator with it. Incidentally, the cable that plugs into the three pin connector - that should be a replacement auxiliarry harness: the original was deemed too small gauge for the job & was replaced with the auxiliary one as a recall. You should find that cable is stand-alone from the main bike harness and you can follow it back to the stator output connection. At both ends you should find the connectors of the original harness that is 'laced' into the complete harness. If you do not find that auxiliary harness, you need to get it. You should be able to get it at no charge from Triumph if the records on your VIN show it was never supplied.

Posted on Nov 10, 2008

Benimur
  • 6966 Answers

SOURCE: Charging system on 2002 yamaha v star.

I posted back in your initial post here. A few ideas to consider/try:

  • normally, there would be 3 wires coming from the stator going to the regulator;
  • AC voltage measured on any pairing of these wires would be higher than 12 depending on the RPM above 1200;
  • DC voltage output would tend to vary from 12 to 13.8/14.2 depending on the RPM;
  • the best check would be to install temporarily anammeter inline with the wire coming from the regulator going to the +terminal of the battery. With this, the presence/absence of thecharging current could be checked.
Cheers.

Posted on Feb 13, 2009

  • 2 Answers

SOURCE: yamaha rxs 100cc note on horn alters when indicators or brakes on

check all your male and female connections on your wires for corrosion and also make sure they are matching with the right colour coated wire

Posted on Apr 25, 2009

  • 93 Answers

SOURCE: yamaha v star 1100 blowing head lights

How's the battery holding up? Check the voltage on the battery and also check to see if it is bubbling a lot. 13.8V is optimal for the battery charging with the engine running, but up to 14.4 is common. If it's running a lot over that and the battery is making a lot of bubbles, probably the regulator is the problem.

If the battery is low on electrolyte, the regulator doesn't have anyplace to dump electrons, and that could also be a problem, so make sure the battery connections are good and tight, too.

Posted on May 21, 2009

  • 13 Answers

SOURCE: the wires going to the voltage regulator keep burning up.

Common problem with poor quality parts, the regulator is the problem, the generator is working other wise you would not have fried the wiring, you answered your own question. someone telling porkies to get more money from unsuspecting client?
The regulator controls the voltage not the generator, the generator only supplys the voltage it cannot overcharge unless the regulator is not working properly, simple!

Posted on Jul 28, 2009

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Why is my 1972 chevelle voltage regulator make noise when you rev it up


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You have a charging fault, it sounds like 1 phase of your alternator is down , so giving a low charge rate check in this order.
alternator winding resistance at the plug/ skt into the regulator and,or reg/ rectifier unit
the plugs clean and connections good.
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MY YAMAHA SR 150 MODEL 2002 , THE BATTERY IS NOT CHARGING EVERY TIME I BUY NEW BATTERY IN FEW DAYS IT WILL DISCHARGE OR DRAIN THE BATTERY POWER


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 battery..it 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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Yamaha WR 250 2003, lights get brighter when you rev it and blow after a few seconds. Is there a regulator to control this


yes it absolutly does have a voltage regulator and the symtoms you describe would indicate it's not feeling well but before you replace it make sure the the connections are corrosion free and the wire that goes to ground is snug Clymer makes an excellent shop manual for this bike worth the investment
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1 Answer

Can a voltage regulator/rectifier if not working properly blow the main fuse. I have a 2002 v-star 1100. I was riding when all of a sudden the bike died on me. I lost all power no light, turn signals,...


YES!
Good link here:
http://www.flygenring.dk/yamaha/artikler/1100ChargingSystem.pdf

Symptoms:
Lights flickering at times and/or battery gets hot to the touch

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When the regulator dies, it allows as much as 19 volts to appear across the battery. This is not good. It will cook the battery and the battery could even explode. Fuse can not stand up to this!





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If you take a look at the parts microfiche (make sure this is your bike please), the voltage regulator and rectifier is a little under $70. Labor for installing it would probably be in the $200-300 dollar range at a dealer.

Have you checked the voltage while the bike is running? It could be that the lights are simply drawing more power than the charging system can put out. Put a voltmeter on the bike and start it. Rev engine to 2-4000 rpm (or just ride the bike if you can see the meter while riding). Check with extra lights off and extra lights on. If your voltage is 14+ while riding or reving the engine without the extra lights on I think your charging system is probably OK. If it is below 13 (again, without the extra lights on) I say the charging system is bad.

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