Charging problems

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janerik

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Charging problems on my 76 xs 650B.

i have measured the Ohm between the phases from the stator , and between
1-2 , 2-3 and 1-3 I have .5 - .6 , after I've taken away 0.2 from my instrument .
When I switch on the ignition , and put a thin metal blade on the outside of the stator ,
I can see the magnet is ok .

After what I 've read , this seems ok .

But when I start up the engine , and measure the voltage out and up to the battery ,

it is Zero and Nothing .

Anyone with some good ideas ?
 
Janerik

Yep, retiredgentleman is a man to listen to - he has passed on a great deal of useful information. Let me add that a voltmeter wired-in to your system is essential. I wired-in a cheap Chinese voltmeter between the ignition switch and the fusebox.

Your readings from the rotor/stator are fine. Make sure your multimeter probes are touching the correct battery terminals and your multimeter is set to 20 volts.

You will get a reading there of the charge in the battery, and when the engine is running above say 3000 rpm the reading should 13.6 to 14.4 volts. No reading?

1. let's take it the battery is in order.
2. check all connections in the charging system.
3. check the ground for the battery and the regulator-rectifier.

ANLAF
 
Welcome to the site. If you are reading 0 volts at the battery turn on the meter. Red to plus side of battery black to minus. Meter set to DC volts.
 
Meter on DC , measuring batt. = 12, 5V , meter on AC measuring from stator ,= O,0 V
Measured brushes = 11mm.

Still nothing goes to the rectifier.
 
janerik said:
Meter on DC , measuring batt. = 12, 5V , meter on AC measuring from stator ,= O,0 V
Measured brushes = 11mm.

Still nothing goes to the rectifier.
Click to expand...

Engine idling and AC voltage between any 2 white wires from the stator at 0 volts AC is bad for sure. The stator voltage may be going to ground.

Unplug the rectifier, and unplug the yellow wire coming from the stator. Use your ohmmeter to measure the resistance from any one of the 3 white wires to the steel frame of the alternator. This reading should be infinity or a very high resistance. What do you measure?
 
I took out the old rotor and stator , put in a old rotor an a old stator and everything was ok . This was the easy way to get around the problem , but I'm satisfied .
I still dont know why and what the problem was .
 

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