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Im having similar trouble..car ran fine then wouldnt go..no spark...i have ordered a dizzy but dont yet know if it is the answer but a couple of test you can do with a multimeter are:
assuming distributor and cap are dry and clean,
Look at distributor and you have two multi pin connectors, one with 6 connections and one with two.
turn ignition off
Take off the one with two connection and connect the meter between one of the pins and a good chassis earth. turn ignition on. Should have battery volts (around 12V)
Ignition off
then on the distributor itself check between the two pins on the same connector on resistance check, should be between 0.9 and 1.2 ohms. (primary ignition coil)
Then you need to remove cap and check between the same connector (two pin) on distributor and the output from the secondary coil (this is achieved by inserting probe of meter into a tube like output on the distributor (inside is a contact spring) when youve got your meter on the spring and the terminal of the distributor you should have an impedance of 20000 to 29000 ohms.
If your not within these tolerances then it would seem that at least one of these coils is open or shorted (possibly by water!) and this could be the reason for your loss of spark!
Hope this helps.
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