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99 Kawi zx 900c won't crank or start, I've been told that it's either the stator or rectifier, how can I test these parts to be sure

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The rectifier is the easiest to test by replacing first, but I would not even look that direction, I would start at the starter relay and fuses, test these with a volt meter first, the relay will engage when you press the starter, no voltage no start, voltage but no start then check connections on starter or replace starter motor. rectifier and stator only related to battery charging

Posted on Nov 27, 2013

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The stator and rectifier are parts of the charging circuit, don't control motor operation. An ohm test will check a stator, you need specs to know what it should be. A rectifier changes ac to dc (I think) and has it's own test, which I forget.
Cranking and starting are battery and ignition and fuel things.

Posted on Nov 27, 2013

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Will not hold a charge it has a new battery,stator and rectifier.


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yes it could be

check your battery 1st , then check the stator a/c output

• 10 or 16 Amps DC regulated for charging
battery
• Two black leads (C) from stator
• Yellow connector (D) with two pin
terminals
• Two yellow leads (E) to regulator-rectifier
(F)
• One red lead (B) from regulator-rectifier
to red connector output lead (A)
• 10 and 16 Amp systems use the same
stator, color coding and regulator-rectifier
• Alternator output is determined by the
flywheel alternator magnet size


The stator and regulator-rectifier are the same
for the 10 and 16 Amp systems. The system
output is determined by the flywheel magnet
size.
Test Alternator Output
1. Temporarily disconnect stator wire
harness from the regulator-rectifier.
2. Insert RED test lead (A, Figure 28) into the
V ω receptacle in the meter.
3. Insert BLACK test lead (B) into COM
receptacle.
4. Rotate selector to AC Volts position.
5. Insert RED (A) and BLACK (B) test lead
probes into output terminals (D & E) in
YELLOW connector (C). (Test clip leads
may be attached to either terminal).
6. With the engine running at 3600 rpm, the
output should be no less than:
• 20 volts - 10 Amp System
• 30 volts - 16 Amp System
7. If No or Low output is found, check for
bare wires or other defects. If wiring
defects are not found, replace the stator.
voltage depending on alternator type and magnet size

then check the regulator / rectifier , make sure it is grounded properly

make sure battery earth lead is good

i suspect loss of bat voltage is letting the afterfire solenoid close off the main jet

let me know model and type codes off engine & i will try help further

cheers

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You still cant count them out just because his didnt fix the problem, your gonna need a multimeter and KNOW how to use it and KNOW what your looking for and testing. First relize the charging system is its own circuit, so first make sure the battery is good, sounds dumb but is really important. then check to see if you have permenant magnet (PMS) or an electromagnet system (EMS), EMS is pretty much used in an alternator. and is the regulater and rectifer in one component. you can test the diodes in the rectifier. you can check the stator output in volts AC, check the stator ressistance and the insulation breakdown test, check the wire going from the rectifier to the battery, you can do it with ohms and the key off or volts DC with the key on. so pretty much its either the stator, rectifier, regulator, or somewhere in the charging system wiring.

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Sincerely,

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