Re: [T3] Plug wire resistance

["Ginger D.&Peter P." <gingerd@teleport.com>]

    I don't have original wires, these are Bosh 7mm with 90 deg. elbow at
dizzy end.  All the dizzy ends as well as the coil wires end are not screw
on, just a rubber elbow guiding the wire to some kind of crimped part.
This is why I don't understand the 8" coil wire having 6 or 7 k ohm
resistance.  There is no resistor visible.  I'm measuring from crimped part
to crimped part and getting resistance 6 times the longer plug wires.
    Tonight I spent another 1/2 hour trouble shooting.  I got the motor
started and after warming up, it would run on it's own, albeit roughly.  I
checked both carbs are operating the same, both squirting gas from accel.
jet etc.  When I started pulling plug wires @ the dizzy end, there is no
effect with the #4 pulled, and slight drop if #3 pulled.  If I pull #1 or
#2 the motor dies.  I can see spark jumping about the same for all four
wires when I hold the wire above the dizzy.  I tried pulling the #3 wire
from the plug end and got a little shock!  Not enough to hurt.  I remember
reading I should hold this end against the case or other "ground" and see a
spark jump, but I don't see anything.  I can hear the spark "ticking" when
I do this, but can't see anything.
    Is it possible a weak coil, or bad coil wire would cause only 2
cylinders to not fire?  I guess if these had worse compressing or some
other defect they would stop first.  Anyway, I have my manual's buried due
to a remodeling project, can someone tell me how to check the coil?
    By the way, as expected, home remodeling project means no tranny
rebuilding project... sigh.

Peter Parker
'66 Square; Phillip
Portland, OR

Jim Adney wrote:

> If Phillip has the large connector on the coil end of that wire I think
> it has 5k in it, so this sounds fine. Your rotor should have another
> 5k in it, too.
>
> In general, these have only failed when the resistance goes to
> infinity. It is a wire-wound resistor and it only fails open. Even then
> the spark will simply jump the break for a long time.

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