2002 Yamaha R6 Rectifier or stator problem?

Question

How can you tell which one has gone bad?

This is for 2002 R6.

So I'm riding to school going 30 MPH down hill...all of a sudden the lights were dimming, and the speedo and instruments started shutting down, and then it started running like crap until it died and left me stranded on the side of the road.

I got a new battery the next day, tested the volt on the battery which came to about 13.83V. Started the bike which brought the Voltage down to 9.8V then it went back up to 13.5 Volts. As I rev the bike, volts either stayed constant at 13.5V or slowly went down, never went up. 30 minz of running the bike, i shut off the bike and tried starting it again but no luck. Voltage was at 10.50V!!!

So now I'm going to check the fuse, and the resistance from the alternator wire connectors to the regulator/rectifier wire connectors.

I've also let the bike run then disconnect the negative terminal on the battery but the bike dies. But how come my buddies 2001 R6 still has enough juice to run when we disconnect his negative terminal? I mean his lights flicker, but doesn't die.

So, if all else fails its the Stator correct?

Thanks

Answer 1

Whatever you do, DON'T disconnect the negative battery cable again when the engine is running. It's a good thing you have a charging problem because otherwise you could have sent a voltage spike through several electronic components, bulbs, instruments, etc. The old removing the negative cable trick was for old DC generator equipped vehicles made prior to the mid 60s, not AC alternators.



In your case it could be either the alternator stator or the regulator-rectifier that's bad. In many years of owning bikes, I've never had a reg-rec go bad but have had a number of stators short out. First you need to test the stator. There should be three wires coming from it and you want to check the three pairs of wires (left-right, left-middle, right-middle) with a multi meter set on AC voltage. Not sure of the exact reading you need, but it will probably be in the 40-70 volt range. The exact reading isn't as important as all three pairs being very close to equal. If the stator is bad, you'll get one high reading and two low readings. If the stator checks out ok, chances are it's the reg-rec although it wouldn't hurt to check all battery connections, alternator, regulator and ground connections. Some Kawasakis had a propensity for corrosion to form on the 3 wire connector at the stator. This would cause charging problems as well as melt down the plastic connector.

Answer 2

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RE:

2002 Yamaha R6 Rectifier or stator problem?

How can you tell which one has gone bad?



This is for 2002 R6.



So I'm riding to school going 30 MPH down hill...all of a sudden the lights were dimming, and the speedo and instruments started shutting down, and then it started running like crap until it died and left me stranded on the...

Answer 3

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Unplug the stator,the bike does not have to be running to do this test.With a meter-set on continuity-Check all the pins in the connector for continuity,make sure the black lead is on a good ground.If the stator shows no continuity between the pins,that means it is ok.--Now make sure the connector from the stator to the rectifier is not melted and the pins are touching each other through the melted plastic-if they are you can cut the plugs off and hard wire them together(I have done this to quite a few of them).With everything put back together,put the meter on the battery and check the dc voltage while it is running-should be in the real high 12's to low 13's.Turn the bright lights on and slowly raise the r's till you hit about 4500.You should see the voltage rise to about 14.5 or so then drop down to the lower 13's.If it fails to do that the rectifier is bad....FYI..stators produce AC voltage and the rectifier changes it to dc voltage and distributes it accordingly.Look real close at that melted plug.

Answer 4

2002 Yamaha

Answer 5

Should be somewhere on the subframe near or under the seat or behind the rear cowl coverings. Good Luck!

Answer 6

the problem is in the alternator, it isn't charging the batery,