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Old 07-18-2010, 10:12 PM   #1
Moc05
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Checking My Motorcycle Charging System

Ok So I found an article and did some basic testing and i'm to the point where I don't think the battery is causing my problems.

Symptoms:
Battery is dying
Bike is turning off while riding (headlights dim, dash goes out, etc)
Not turning back on unless I recharge the battery

What I Have Tried:
Pulling the positive lead off of the battery after turning on the bike (Bikes Dies)
Measuring Voltage at the Battery

So what I have so far:
With the bike off Voltage is at 12.9 (After charging)
With the lights on and etc. Voltage is at 12.7
With the bike completely on and motor running Voltage is at 12.4
With the bike completely on and motor revving to 3500RPM Voltage is still at 12.4

So at this point is it safe to say that it is going to be Stator or Rectifier?
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Old 07-19-2010, 08:47 AM   #2
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Old 07-19-2010, 09:11 AM   #3
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Quote:
Originally Posted by DrAwkwArD View Post
It could be either, yes. I'd recommend, before actually purchasing anything, to make sure the leads going to and from the stator and rectifier are tight...it doesn't cost anything to check and you wouldn't be the first person with that problem.

Do you have a manual for the bike? If so, it should detail how to specifically check the stator and rectifier to rule one or the other out.
I do have the service manual for it, I'll look into that a bit more. Just wanted to make sure it was not the battery.
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Old 07-19-2010, 09:24 AM   #4
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If your bike is like my past experience, to check the stator, there should be three large wires coming from the stator. On my bike they were yellow, check your voltage by checking the combination of 2 at a time all combinations. You should be pulling a high voltage, I am going off the top of my head but I think it was around 40-50V at idle and 80-100v at 5-6000 rpms. If any combination gives significantly less than the others, you have a bad stator. If they all stay relatively even, I would point towards either your wiring, and/or the rectifier. Again, research and double check the numbers on your bike as mine was a 900rr and was 3 years ago I had to do it. (so my memory could be bad )
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Old 07-19-2010, 02:00 PM   #5
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Check your stator wires first, you should have AC voltage (check the manual for spec) to the rectifier on 3 wires, usually yellow and heavy gauge. If the voltage checks out then I would suspect a rectifier, if no ac voltage then start with the stator.
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Old 07-19-2010, 02:24 PM   #6
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REGULATED VOLTAGE

• Start the engine and keep it running at 5 000 r/min with the
dimmer switch turned HI position.
• Measure the DC voltage between the + and - battery terminals
using the multi-circuit tester. If the voltage is not within
the specified value, inspect the generator and regulator/rectifier.
(9-10 and -11)
NOTE:
When making this test, be sure that the battery is in fully-charged
condition.
Regulated voltage (Charging output):
14.0 – 15.5 V at 5 000 r/min

GENERATOR COIL RESISTANCE

• Disconnect the generator coupler.
• Measure the resistance between the three lead wires.
If the resistance is out of specified value, replace the stator
with a new one. Also, check that the generator core is insulated
properly.
Generator coil resistance: 0.2 – 0.9 Ω (White – White)
∞ Ω (White – Ground)

ELECTRICAL SYSTEM 9-11
GENERATOR NO-LOAD PERFORMANCE

• Disconnect the generator coupler.
• Start the engine and keep it running at 5 000 r/min.
• Using the multi-circuit tester, measure the voltage between
three lead wires.
If the tester reads under the specified value, replace the generator
with a new one.

Generator no-load performance:
65 V (AC) and more at 5 000 r/min (When engine is cold)
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Old 07-28-2010, 06:50 PM   #7
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Ok so I have a regulator
nQ7du
and a multimeter
Er5ec

How do I check if its bad?
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Old 07-28-2010, 09:58 PM   #8
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Do a diode Check! That little box is kinda cool when you know how it does what it does. SCR's Joe, they make that little bit o magic work and if they are not working right then it's a paper weight.
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Old 07-29-2010, 01:37 PM   #9
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Quote:
Originally Posted by cajun315 View Post
Do a diode Check! That little box is kinda cool when you know how it does what it does. SCR's Joe, they make that little bit o magic work and if they are not working right then it's a paper weight.
Can you give me a bit more info or is a diode check something pretty standard?
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Old 10-12-2010, 02:28 PM   #10
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Finally ordered the part, it was the regulator that was bad afterall. Replaced it yesterday and all is well.
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Old 10-12-2010, 03:41 PM   #11
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Check out that stator, it can fry a rectifier if it is bad. If so, it will just kill the new one as well. Glad to see you got it going again though.
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Old 10-13-2010, 02:42 PM   #12
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Quote:
Originally Posted by cogs69 View Post
Check out that stator, it can fry a rectifier if it is bad. If so, it will just kill the new one as well. Glad to see you got it going again though.
Yea, I plan on keeping an eye on it and checking the voltage after I get it out and ride.
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