Topic: Not exactly Honda charging issue.

[Paul]

Please excuse the "Non Honda" post but I'm in trouble.
And the non honda section is not as frequented as here.
Basically I've just sold my GS750 and the damn charging system has gone arse-up.
Same principal as the hondas.

I was getting continunity in both directions on the RR(disconnected).....therefore...bust.
Ordered and rec'd a new one (Checked... OK)
Still no charge, so checked the stator ...0.8Ohms across any three pairs (above average, but fine.?)
Checked continunity between 3 yellows and ground...clear.
Checked AC voltage across disconnected stator wires when running above 5KRPM...2.5 -3 Vac. ON ALL THREE
Removed cover and all components look as good as new...bit dark but & battery is good.

What I can't understand....all the checks above seem to be ok but the result is not good.
What other reason could there be

Help, ....have tried other sites ...but I've never got a response that hasn't vexed me more.
And I know you're all good here.

[TwoTired]

If it works on the same principle as the SOHC4 (besides the 650), then you need to check out the field coil.   The stator's low output indicates a very weak magnetic field in the alternator.   If it doesn't have a field coil, then you should supply a pointer to the bike's wire diagram.

[oldbiker]

My manual on the GS650 shows that the alternator uses a permanent magnet to generate the AC so if your output is only 2-3 volts the magnet has somehow lost its magnetism or else there are some pretty bad connections in your wiring. I stress that this manual is for the GS650 but I will be surprised if the GS750 is different.

[bike54]

hi
try http://www.thegsresources.com/garage/gs_statorfacts.htm commom fault on the gs series of bikes the above should sort you out with what the problem is

merv 

[Paul]

Thank you,
I now know not only was the R/R faulty but the stator is also gone, (well actually i think the stator might be ok because all the "stator" tests are giving positive results) so as indicated above ....my magnetic field is gone.  F***. (there is no field coil in these)
Have been on the GS site before this and frankly ..I'm not impressed, all the replies i got were so far off the point they were of no use...It's like being in school "Read the QUESTION and answer accordingly"
Now all I got to do is remove the magnet, point it towards North and rub vigourisly 

Paul.

[bike54]

hi Paul
no problem checking the magnet you should feel it pulling the stator when you either remove it or refit it i have the same charging system on my gsx same bike just a 4 valve head against your 2 valve i have known stators read OK but still be faulty what makes them fail is heat it melts the insulation varnish so a low voltage like off a multimeter could read OK but the higher voltage of its normal output will burn straight through the replacement from http://www.electrexworld.co.uk/ are a lot better than the Suzuki ones but i don't know if they do one for the gs
i agree about the gs resource forum but the search function is quite useful some times

merv 

[crazypj]

I dont remember GS750 being same as Honda, its permanent magnet for one thing and the left handle bar switches a 3rd set of winding on when the lights are on (permanently bridged on later models without the ability to turn lights off) Its a somewhat weird system compared to the Honda.
I found what usually happens to GS range is as follows.
Batter is dead or very low.
Jump start from automobile, etc,
battery charges at max amps.Re/rect overheats and fails.
battery goes dead constantly, assumed defective.
New battery fitted,drains through faulty reg/rect, cooks alternator windings.
New windings, reg/rec/battery required
PJ

[Paul]

OK last post,
should be in "other bikes" so appologies for hijacking this area.
GS's have one phase running to the headlight, bad idea, not sure how exactly as it seems to be still AC.
Replaced RR with Electrex, stator issue now....fried.
Magnet ok,
replacement stator has become available from a donor engine.
bike sold pending collection....oh ...and repair!
Back to my Honda.
and a search for a CB750K...next project.