Question about 1979 Ford F 350

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On my 1973 ford f350 after the truck starts and ilet go of the key it dies. What to do? the switch is good. Looking for a starting/running circuit diagram!

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Re-adjust the ignition switch.

Posted on Sep 06, 2010

  • jimenez52000 Sep 06, 2010

    How is this done?

  • DillyWackSac
    DillyWackSac Sep 06, 2010

    Loosen the two nuts and slide the switch up and or down keep readjusting until you can let go of the key and it stays running. You will have to lay under the dash the switch is along side the column.



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well a couple of things, the Fords use the big old external solenoid most likely on yours, you did not mention the year. It will have 4 or 3 wires, if it has 3 then the small wire is from the key switch, if it has 4 the 2 small wires are either 12+ from key and ground or 12+ from the key and the other goes to the coil, since you have an F350 is it a diesel or gas, because there is a glow plug relay also. Need more info !!! You can apply 12 vdc directly to the starter wire from key and see if relay clicks.

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81 Ford pickup starts while key is in start position, but dies when you release the key to run position.

You're probably loosing power to the coil or the ignition module from the key switch. The ignition system gets power from the key switch in the on position, and also from the starter solenoid in the start position.
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You can get a free wiring diagram and fusebox layouts at Just register your truck on their site.

If you look at the wiring diagrams you should see that the starter lockouts and shift interlock is a separate process. Neutral is a position which allows the starter to work.

What you are having problems with is the RUN circuit on the ignition side. You could have a bad ignition switch. The switch should have an Ignition Relay in the Powerbox. If this is the Diesel, they have a KILL circuit to stop the engine that is different than a gas engine since the Diesel fires by compression.

So looking at your wiring diagram, you would be looking for a connector or component which could cut out intermittently. I am thinking more of a Relay because you have to reengerize the circuit by turning the ignition switch to OFF, before going to CRANK, and then RUN. Most of the time, the starter interlock only controls the start circuit.

Another possibility is the Antitheft. If the KEYreader loses communication with the Security system, it may stall. I know that vehicles will not start without the correct key or if an unprogrammed Blank is inserted.

I hope my solution helps.

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