1979 ignition systems
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Senior User
Joined: Jan 2004
Posts: 131
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From: Midwest
1979 ignition systems
My '79 F-150 won't start. It has a 351M with a 4 speed manual tranny. I just replaced the electronic ignition box, starter relay. The only time it will show any spark is when you let off of the key switch. If you hit the ignition box with some pliars it will show intermitten spark, with the key and if you bypass it on the starter relay. I bench checked the distributor it didn't check out. No resistance on the magnetic pickup. Could the old ignition box have fried my distributor? I have also heard of the key switch making it have intermitten spark. Any ideas would be greatly appreciated. Thanks
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Joined: Aug 2000
Posts: 1,984
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Torque1 is correct, the pickup coil should have some resistance when a reading is taken across the coil. You either have an open in the coil or wiring. The wiring flexes when the vacuum advance moves the mounting plate, and this causes it to break.
