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dead battery... did my tests

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Old Sep 22, 2010 | 10:00 PM
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Default dead battery... did my tests

Ok so checked the voltage on the battery and it was 12.8v. I rev'd the bike up to 5k and it styed at 12.8v. I then did a leak test and it was 1.33mA. I also had the battery tested at an autozone and the battery tested good. So i guess my question now is how do i further check whether it's the stator or rectifier.
 
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Old Sep 22, 2010 | 10:24 PM
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unplug the connection from the stator, check all three wires. u should have 50 or more volts coming from each one. then see if there is continuity to ground on each wire.

if these are wrong then the stator took a dump. and most likely the r/r too. best bet is to buy a new one of each, and replace.
 
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Old Sep 22, 2010 | 10:32 PM
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Ok im going to do these tests when i get home. I post results.
 
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Old Sep 22, 2010 | 11:09 PM
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IMO, the rectifier is not doing it's job. If you had 12.8v at 5k RPM, it's not allowing the battery to charge. You should see at lease 13.5v at 5K RPM.
 
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Old Sep 22, 2010 | 11:57 PM
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I took the stator out and it seems fine. Nothing looks burnt up. Now when testing the yellow wires on te stator do you leave the plug connected and start the engine and test its voltge output?
 
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Old Sep 23, 2010 | 02:45 AM
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I unplugged the stator plug and tested the battery while running and the voltage was dropping from 12.7v to 12.1 so I plug the stator back in and INSTANTLY it started charging 13.5v. Ok so I thought somehow it might have been a bad connection with the plug, so I tried it again. This time, when I plugged the stator plug in while running it only went to 12.4v and held there and the bike died. So confused at this point.
 
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Old Sep 23, 2010 | 05:55 AM
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Most common non charging issues are stator issues. Most common over charging issues are rectifier. If your not charging in the 14's at 2000 rpms or higher, check the stator. The best way to do it is to measure the resistance across the 3 leads. With the bike off, remove the plug and expose the 3 leads. Now, across all leads, 2 at a time, measure the resistance. such measure across 1 and 2, 1 and 3, and 2 and 3. All three measurments must fall with the spec. Im not sure what bike you have. so you may have to find the spec for your bike. Most common would be for resistance to fall between .1-1.0. But they should all be very close to the same. Also, check for continuity between a ground and each wire. If there is continuity, the stator is shorted and needs to be replaced. Visual inspection of the stator will not tell you anything. Stators generally do not look bad, they just go bad.

If the stator checks out ok, then the rectifier is more than likely the problem. That is of course as long as you have already checked all of yoru connections at the battery, and grounds on the chassis to make sure everything is good. A corroded battery terminal can cause your issues and its fairly common. If you didn't clean the connections at the battery, I would suggest doing so.

Also, you should never unplug or plug in a stator while the bike is running. Any arcing that may occur can ruin any component of the charging system.
 
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Old Sep 23, 2010 | 05:21 PM
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I saw there were grounds on the body right under the gas tank... i checked those and they are good. Ill have to recheck the stator then before i order the wrong part.
 
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