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Dynamo checking #658981
07/02/16 3:27 am
07/02/16 3:27 am
Joined: May 2006
Posts: 151
Warrington, Cheshire, UK
TriVin Offline OP
BritBike Forum member
TriVin  Offline OP
BritBike Forum member

Joined: May 2006
Posts: 151
Warrington, Cheshire, UK
My Comet recently stopped charging. I charged the battery and then checked between the battery terminals with a meter, whilst revving the throttle but it showed no rising voltage so I suspect the solid state regulator is faulty. However whilst at this stage I thought I would check the dynamo output. Seems I have to put a heavy wire link between the D and F terminals (I assume D & F are the terminals that the 2 out put wires are connected to) then connect my meter to one of them and earth to get a running reading. My question is, as an electricity illiterate, is why must it be a heavier wire and why cant you just put a meter between the 2 output wires that go to the regulator?

thanks


Dave
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Vincent Comet 1952
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Re: Dynamo checking [Re: TriVin] #658986
07/02/16 4:36 am
07/02/16 4:36 am
Joined: Aug 2001
Posts: 7,549
scotland
triton thrasher Offline
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triton thrasher  Offline
BritBike Forum member

Joined: Aug 2001
Posts: 7,549
scotland
If this is a Lucas dynamo, D and F should be connected together (and isolated from the rest of the wiring) for the test. It doesn't matter much what you use to connect them.

A voltmeter then connected between your D F and engine casing should show voltage rising over 20V as you rev up from idle.

A headlamp bulb connected between D F and engine casing should light brightly as you rev up.

If there's no dynamo output, try briefly connecting only F to battery live.

If It's a Miller dynamo with a built-in cutout, I know nothing about them.


Amateur Loctite enthusiast.

Moderated by  John Healy 


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