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Generator Test

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Generator Test

Post  Brentis1 on Wed Sep 07, 2016 10:03 am

Hi Guys,

A generic bike question about how to best test a bike mounted generator. We have a 6VDC generator which a terminal marked F (for field) and a terminal marked D. Looking at the schematic shows the field winding and armature connected in series, with one of the brushes connected to the frame. We have tested for voltage across the terminals F an D And no voltage. And each of the terminals to the chassis. Once again no voltage. If we short the F and D terminals together we get 12V to the frame.

Does anyone have any suggestions. The bike is a 1950s AJS.

Any help appreciated!

Brent

Brentis1

Posts : 42
Join date : 2016-06-11

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Re: Generator Test

Post  kerabo on Thu Sep 08, 2016 6:18 am

Remove the output wires and join D and F at the Dynamo . Connect a test meter between the joined wires and Earth or just to prove a point a strong 12v bulb . Run the engine but not too fast as there is no control.
If it's charging you will soon know as the bulb will be very bright. Dynamos can loose their polarity although not often but if everything else looks ok connect a wire to the Dynamo field and flash it .Just a flash Across your battery live terminal. You may see a small spark.
That's a test of the dyanmo only.
Reading your message it sounds like your on the right track.
You can do the same test using the wires from the Dyanmo but back at the Regulator Disconnected again. This will test the wiring.
Regards Ken
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kerabo

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Re: Generator Test

Post  Brentis1 on Thu Sep 08, 2016 8:50 pm

Thanks for the advice Ken - will give that a try!

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Join date : 2016-06-11

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Re: Generator Test

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