gt550 charge fault

[jabcb]

Its a good idea to disconnect the battery when you take ohm readings.
If you are careful & know what you are doing then you often don't have to, but if you make a mistake you can damage your meter.

Wiring diagram for GT550B is here: download/file.php?id=824

Alternator specs are on page 15 of here: http://www.ozebook.com/compendium/suzi/suzidata1.htm
Make sure to read the note.

Your bike has either a Kokusan or Nippon Denso alternator.
If the brushes are parallel to the crank, then you have a Kokusan alternator.
If the brushes point toward the crank centerline, then you have a Nippon Denso alternator.

Disconnect the alternator wiring connector from the wiring harness. It will have either 4 or 5 wires.
The 3 yellow wires are for the stator & the green wire is for the rotor.
Ignore the blue wire if you have one -- its for the neutral indicator.

Set your meter to the 200 ohm scale. (The omega symbol indicates ohms.)

To check the stator:
1) Measure the resistance between each yellow wire & ground. You should get an open circuit for these readings.
2) Measure the resistance between each pair of yellow wires. You should get a small value that is approximately the same for each pair.

To check the rotor:
Measure resistance between the green wire & ground. Reading will depend on which alternator you have.
2 to 5 ohms for Kokusan & 10 to 20 ohms for Nippon Denso.

[carlo]

Thanks for all replyes and links.
I'm lucky sunday, a guy, who has a better knowledge about this than I, will come help me.
I will show him the information you all gave me.
Thanks a lot