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Re: [T3] Testing out a coil, car not starting


With ignition on, you should get voltage between each terminal and ground on
both sides if the points are open but only between 15 and ground if they are
closed.  With points closed the voltage between the two side terminals should be
close to 12V.  The points effectively ground the terminal 1 when closed, so
there should be zero volts from terminal 1 to ground with points closed.

The resistance of the primary coil (terminals 15 and 1) sounds about right.  The
secondary coil of 9,500 ohms sounds OK, but I've never measured it.

Check the points are clean, the baseplate braided wire is intact, the
distributor is earthed to the engine (through the clamp, gears etc) the points
wire is intact and not shorting to the body where it goes through the casing
eg..

Dave.
UK VW Type 3 & 4 Club
http://www.hallvw.clara.co.uk/
------
----- Original Message ----- 
From: "Constantino Tobio" <ctobio@gmail.com>
To: <type3@vwtype3.org>
Sent: Saturday, September 02, 2006 11:06 PM
Subject: [T3] Testing out a coil, car not starting


> So, my 73 Fasty won't start. From the looks of it, I'm not getting
> spark- holding the coil wire near a ground shows no spark whatsoever,
> and I smell fuel in my exhaust, so I'm pretty confident that the fuel
> part of the operation is good.
>
> I get voltage to the coil- on both sides, but I also get voltage on
> both sides when the points are open. I tested out the points and
> they're not shorting. I swapped in a new condenser, but this was just
> throwing parts at the issue- both condensers are Bosch, as are the
> points.
>
> Disconnecting terminals 1 and 15 of the coil, and putting a multimeter
> across both lugs, gives me a resistance of zero ohms, and running the
> meter for continuity test shows it's indeed continuous across the two
> lugs. Resistance from each lug to the coil wire connector is around 8k
> ohms. I'm reading that resistance across 1 and 15 should be more like
> 20,000 ohms.
>
> So, indeed it appears that my coil would be shorted across the two
> windings somehow.
>
> Is this diagnosis sound? The coil appears to be an OE black coil, best
> as I can tell its the one it came with.
>
> If I do indeed have a sound diagnosis, Jim- I may be interested in one
> of your OE black coils.
>
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>
>
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