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#658981 - 07/02/16 3:27 am Dynamo checking  
Joined: May 2006
Posts: 148
TriVin Offline
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TriVin  Offline
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Joined: May 2006
Posts: 148
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
Tiger 100SS 1966
T120V 1972
Vincent Comet 1952
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#658986 - 07/02/16 4:36 am Re: Dynamo checking [Re: TriVin]  
Joined: Aug 2001
Posts: 6,903
triton thrasher Online content
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triton thrasher  Online Content
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Joined: Aug 2001
Posts: 6,903
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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