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Robert View Drop Down
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    Posted: 16 May 2020 at 18:02
1982 sp no charge - readings on rotor 3.4 ohms between slip rings .
Slip rings to earth infinite so all seems good with rotor. Stator .7 ohms between each terminal , each one to earth no reading. I bought a new diode board - no charge , new voltage regulator- no charge.
I then sent my rotor & stator to Westcountry windings they suggested I should be getting a charge from the components even though they detected a slight earthing of the rotor ,I purchased a new rotor & flashed it as recommended - still no charge Cry 
Reading from three yellow wires a miserly 3 volts . Where do I go from here as I’m completely stumped - can anyone help.
Thanks
Robert
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Ken-Guzzibear View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:20
have you looked on The Shed on Gutsibits site really easy to follow how to check charging system

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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:37
Originally posted by Robert Robert wrote:

1982 sp no charge - readings on rotor 3.4 ohms between slip rings .
Slip rings to earth infinite so all seems good with rotor.


No, one of them should be zero Ohms to engine & frame

Either you got oxidation crudding up where the stator mounts onto the timing chest, or a brush is open-circuit



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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:43
Yes, that's where your problem is. One brush is fed from the regulator the other connected to earth. If that earth connection is missing, you won't get any charging, or any output from the alternator.
Brian.

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Robert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robert Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:45
Each slip ring to rotor body is 0 ohms - tested on & off bike.
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:50
Slip ring to rotor body a dead short? You said infinite earlier.
Either way it's wrong. Neither slip ring should be connected to earth. One of the brushes is connected to earth. Check between the brushes and tell us what the resistance is, then check either brush to earth.
Brian.

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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:50
(EDIT: Brian posted before me)

I wrote:
I presume you mean no resistance, i.e. infinite?

One brush must be connected to engine and frame, I think it's the lower one. It's the other one that's insulated and the regulator wire connects to.



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Robert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robert Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:51
Hi Brian new brushes fitted - insulator on the regulator feed side good & extra ground wire on ground side fitted to make sure so no problem there.
Thanks 
Robert
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:52
I think there is a terminolagy problem.
0 ohms is a dead short, infinity is the opposite, no connection.
Brian.

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Robert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robert Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:54
Yes I’ve looked at that and it’s very easy to understand but still no answers.
Thanks 
Robert
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 18:56
This is the difficulty of "diagnosing from a distance" LOL

Can you get a resistance reading between either slip ring and the engine crankcase?

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Richard Hyatt View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richard Hyatt Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 19:06
You seem to have replaced a great many components for sure.

Try this though to split the fault into 2 areas.
Leave everything connected except the single wire coming from the regulator to the upper brush , remove this wire from the brush terminal.
Get your meter on volts ready, black negative lead to earth and red positive lead clipped to the this lead terminal from the regulator. 
Turn ignition on
Do you get 12 volt reading????
Does the red battery light on the dash come on if you touch this lead terminal to earth?
Try this and then we can move onwards from there.
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Robert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robert Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 19:47
Hi Brian please find below my readings

Slip ring to slip ring 2.8 ohms ( new rotor )
DF spade to D spade 3 ohms 
Front slip ring to frame 3 ohms
Rear slip ring to frame 0.1 ohms
All above readings with brushes on slip rings 

Both brushes off 2.8 slip ring to slip ring
Both brushes off 0 reading to frame
Both brushes off DF spade to D spade 0 reading

Hope this helps
Thanks 
Rober
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Robert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robert Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 20:03
Hi , I removed the wire from the upper brush - connected voltmeter to wire and to earth ignition on 12 volts or close but charge light doesn’t come on.
Robert
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Richard Hyatt View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richard Hyatt Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2020 at 20:47
Ok , nearly there.
The fact you're getting 12 volts is good
Just now remove your meter clip from the terminal and touch the terminal to earth.
With the ignition on now , should bring the battery light on.

What you're checking with this procedure is the part of the circuit that creates the magnetism in the rotor.
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