Re: No spark

Posted by KEB on May 16, 2007 at 20:53:50 from (72.19.170.5):

In Reply to: No spark posted by CNKS on May 16, 2007 at 17:34:07:

Here's an easy check. Connect a test light between the (-) terminal on the coil (the one that goes to the points) and ground. An analog voltmeter will also work, but a light is easier to see. A digital voltmeter is not good for measuring pulses like you expect to see.

Turn the ignition on & crank the engine.

You should see the light pulse on & off as the points open & close. If the light pulses, but you don't have a spark when you hold the high tension wire coming out of the coil next to ground, either the high tension side of the coil is open or the high voltage wire itself is bad. Replace as needed.

If the light never comes on, disconnect the wire to the distributor from the (-) terminal, leave the test light connected, and turn the ignition on (don't have to crank). If the light comes on now, you have power to and through the ignition coil and either the points or the wire between the (-) coil terminal and the points is shorting to ground.

If the light still doesn't come on, check at the (+) terminal with the ignition on. If you have power at the (+) terminal but not at the (-) (with the wire to the points disconnected), the primary side of the coil is open and it will have to be replaced.

If the light comes on and stays on, the points are not closing. First place to check is for an open circuit in the wire between the (-) terminal on the coil and the points. Its common for the points wire to either short or break inside the insulation where it enters the distributor.

Good luck, let us know what happens.

Keith

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