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Re: [T3] ignition troubleshooting


On 2 Jan 2002, at 9:21, veedub@apartment101.com wrote:

> I've used a test light and a voltometer.  I get a solid 12V at both
> sides of the coil with the ignition on.

The + side of the coil should have 12V all the time. The - side 
should have 12V when the points are open and 0V when the points 
are closed.

> Should I be seeing voltage at the "inner" side of the points (the side
> nearest to the dizzy shaft)?  I see voltage contstantly at the outside
> half of the points when I rotate the engine or the dizzy.

If by "inner" you mean the stationary side, then this should always 
be ground (0V.) The movable point should have 12V when the 
points are open and 0V when they are closed. If this point is 
always at 12V then the points aren't closing. [Exception: If you're 
measuring this with the dizzy out, then the dizzy itself is no longer 
grounded so everything on it will float up to 12V when the points 
are closed.]

> I had a juice reading at one time on the dizzy shaft, but I could
> never get a voltage reading at the inner side of the points. I thought
> that was strange (unless I'm not understanding the pathflow of the
> voltage properly).

The shaft itself should always be grounded, 0V (unless you have 
the dizzy out of the engine.)

> Thanks for all your advice.  I'm off now to double check the
> resistance in the rotor and the dizzy cap-to-coil wire.

Some rotors have 0 Ohms while other have 5000 Ohms. Both work 
fine, but the former will make more noise on your AM radio.

-
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA

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