• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Had to take the car to work today...

  • Thread starter Thread starter xifer
  • Start date Start date
X

xifer

Guest
Hi All,
Before I spend loads of dosh, am I missing anything?

Bike started running rough, wouldn't bump start, I figured
battery needs replacing, as does the chain.

Still original electrics reg/rect/ quite new points & condensors.

New chain and charged battery freed up loads of power (felt really
strong and smooth) but then yeach, morass of struggling cyclinders
again after about 10mins hard riding.

Read about jump starting of car batteries when the vehicle is running
being ''a bad thing'' and I did that very thing a few days before at
a petrol (gas) station. Guy in a jeep with 2 x stomping batteries
(80 amps!) and the enging going.

but the bike sounded rough before anyway and wouldn't bump start...



So I've had the multimeter out:


2500 rpm - 14.6 v DC

5000 rpm - 14.9 v DC

1000 rpm - 15v dropping back to 13.5 (letting go the throttle from 5000 revs)


I got only 8-12V AC on each of the generator outputs (should be 60V AC) so
I'm wondering how come I get such high charging voltage? Is it because
resistance is up and there is less current, therefore less power being generated
but same voltage?!

...and some 1000 ohms to earth from each phase wire (should be infinite?).

Reg and Rect seem ok continuity each way seemed ok but I'm not sure about diode testing.

So, I figure, if I keep the battery charged, it'll keep me going until
end of the month when I can afford new parts.

Despite charging battery overnight bike wouldn't start in the morning - seems it will only start on a hot day (higher atmospheric pressure or
just temp?).


I guess I need new alternator, battery, rectifier and probably regulator.
Of course I may be completly missing something?


any insight would be appreciated!

happy riding!
 
Re: Had to take the car to work today...

If you only have 8 to 12 V AC on each phase of the stator, then the stator is faulty. As for why you have such a high DC charging voltage, voltage is electrical pressure, amperage is capacity. You could stack 10 AA flashlight batteries and get 15 volts, but you will not have enough capacity to start the bike.


Earl


xifer said:
I got only 8-12V AC on each of the generator outputs (should be 60V AC) so
I'm wondering how come I get such high charging voltage? Is it because
resistance is up and there is less current, therefore less power being generated
but same voltage?!
Click to expand...
 
You 12v AC?? ARE you measuring between the wires? & not from ground?? with them disconnected from the reg.. Yes The resistance from the stator wire to ground should be infinite-- again with the wires disconnected
 
You 12v AC?? ARE you measuring between the wires? & not from ground?? with them disconnected from the reg.
Click to expand...


Well they were not disconnected from the RR but they should
still be ~60VAC between the wires, right?
 
NO. You must have the stator disconnected from the R/R and the bike running at 5k rpm to take the reading on the stator wires, Meter set to the AC 200 scale. If stator wires are numbered 1,2 and 3, the meter connections must be between 1 and 2 for phase 1, between 2 and 3 for phase 2 and between 1 and 3 for phase 3. Each phase should show 80v AC at 5k rpm.

Earl

xifer said:
Well they were not disconnected from the RR but they should
still be ~60VAC between the wires, right?
Click to expand...
 
ok, sh&*t, thing is I couldn't see how to disconnect without
damaging the connectors so I just measured it. Don't
understand why the voltage shouldn't be about 60V anyway
but I'll go measure it again with the wires off.
 
I would replace the OE RR asap. Doesn't regulate the third phase of the alternator. Could save some headache down the road. Also a separate ground wire from RR neg. directly to battery neg. is good insurance.
 
So I disconnected the stator wires from the RR and I get
the same VAC as when they are connected. Lucky
for me there is only 8~12VAC on 2 phases so it doesn't
matter I cut the cables...

Why do people say the Stator needs disconnected from the
RR to measure the output? Its not required.
 
If the reg/rect is toast it could load the stator dropping the voltage. check & make sure you did not pinch the wires with the stator cover
 
If the reg/rect is toast it could load the stator dropping the voltage. check & make sure you did not pinch the wires with the stator cover
Click to expand...

I'm not convinced that would drop the voltage. Current maybe.

Similar with testing batt charging voltage - waste of time. What you
need to do is check the current & the voltage. E.g. I had 14.8 volts
at the terminals but no charging power... as we all know:

POWER = VOLTS * AMPS

or POWER = AMPS * AMPS * OHMS

Fried electrics raises resistances

Volts = amps * ohms

increase the resistance and the _current_ drops - not the voltage.

Anyways, the stator and RR are indeed toast and new ones are on
order.
 
You must log in or register to reply here.
Back
Top