[DMCForum] Re: Electrical gremlin... no power at coil
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[DMCForum] Re: Electrical gremlin... no power at coil



Don't have car or tech manual at office, so don't quote me on wire colors:

Line into coil (+) should be 8-10 volts. Full 12 volts would
eventually barbeque ignition module, but is OK to jump temporarily to
start car. That's whole purpose of resistor network and start relay.

Can't remember exactly how much lower, but coil ground (-) is less
than input. Remember that it's still hot at this point (actual ground
inside ignition module).

Use Ohm setting on meter to test coil itself. Bosch is some fantastic
number in the thousands (9,000?). My Pertronix is 1.5 I think.

Test for HT with timing light on coil output, or old fashioned gound
to block test (that one still scares me. Shocked ever living mess out
of myself once. Have no desire to do twice).

If your voltages are correct, coil is good, but no HT, ignition module
may be bad OR MAY HAVE LOST GROUND. Before declaring module hopeless,
run temporary known good ground. All 5 of my Lincolns have new ground
wires due to design flaw. DeLo may be comparable. Remember: it IS a
plastic car...

Oh, you could have distributor problem. Make sure sensor wire to
ignition module plugged in. Don't know how many volts it carries, but
should see some sort of reading if you pierce insulation. Didn't
forget to put rotor button back in?

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, Travis Goodwin <tgoodwin@xxxx> wrote:
> No spark = no start.
> 
> I traced it back to the coil. I tried a new one just to be sure but
it was
> fruitless. Then I checked all the fuses. Everything's ok. 
> 
> When I go to start the car I am assuming I should have 12V across
the coil,
> which I do not at the moment. I checked voltage on the right side. The
> voltage from the resistor is ok and I have continuity and ground to the
> capacitor. The trouble seems to be on the left side. I've got
nothing coming
> from the White/Slate wire that leads to the ignition control behind the
> driver's seat.
> 
> What are the conditions required to get power to that side of the coil?
> Maybe I'm misunderstanding something altogether. Can anyone shed
some light
> on this puzzler?



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