1990 F250 diesel Ignition problem
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Cross-Country
Joined: Dec 2002
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From: highland us
1990 F250 diesel Ignition problem
I was replace the fuel return lines from the injectors, after completing the starter wouldn't start. I replaced the starter, starter solenoid, fender solenoid and the batteries and worked fine for a week. I have noticed that when I shut the truck off sometimes the radio stays on so I turn the key as if to start back to the lock position and the radio turns off. Last night starting it several times it refused to start, no starter. So I put the charger on and the batteries were dead, changed all day, still nothing, all night and it was still changing a 5 amps. So i got underneath the truck to check starter wiring. I had smelled something yesterday while driving, it looks good but the starter was warm, I touched the solenoid and got a 2nd degree burn. I assume something in the starter wiring has shorted somewhere in the starting and radio wiring, is this correct? What could do that in this truck? I am the original owner and the steering column has never been touched, even original keys.
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From: Angier, NC
The clue for me is the radio staying on 
What dose that have to do with the starter system?
What do the 2 systems have in common?
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I will help you the key!
Or better yet the IGN switch.
When you turned it off the switch did not go all the way off and why the radio stayed on.
I am guessing it is also sending just a little power to the starter or it engauged when you were inside and cranked the motor till the batteries went dead.
I would replace the IGN switch and go from there.
Dave ----
What dose that have to do with the starter system?
What do the 2 systems have in common?
-
-
-
-
-
-
-
-
I will help you the key!
Or better yet the IGN switch.
When you turned it off the switch did not go all the way off and why the radio stayed on.
I am guessing it is also sending just a little power to the starter or it engauged when you were inside and cranked the motor till the batteries went dead.
I would replace the IGN switch and go from there.
Dave ----
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Cross-Country
Joined: Dec 2002
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From: highland us
Are there any mechanical contacts the Ignition switch, I have to believe that is where the problem is.in the mechanical contacts, where are they on this truck?
Well actually the switch went past OFF to accessory I believe, so when I turn it back to OFF even without the key the radio goes off and the batteries are not drained.
So where are those mechanical contacts in this system?
Well actually the switch went past OFF to accessory I believe, so when I turn it back to OFF even without the key the radio goes off and the batteries are not drained.
So where are those mechanical contacts in this system?
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Cross-Country
Joined: Dec 2002
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From: highland us
Help me here guys. The Ignition switch is low on the steering column correct, but it just has electrical connection attached to it. How does it know I am jiggling to switch? It seems to me that it must be something attached to the ignition lock or tumbler, where a rotation mechanical effort is converted into electrical by contacts and the rotating the key makes contact at different positions. How does the Ignition switch convert the rotation of the key between different wires? Am I just stuck in the 1960s, when the turning the key physically made contact with different wires?
Logistics Pro
Joined: Nov 2013
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From: Mojave, Ca
Help me here guys. The Ignition switch is low on the steering column correct, but it just has electrical connection attached to it. How does it know I am jiggling to switch? It seems to me that it must be something attached to the ignition lock or tumbler, where a rotation mechanical effort is converted into electrical by contacts and the rotating the key makes contact at different positions. How does the Ignition switch convert the rotation of the key between different wires? Am I just stuck in the 1960s, when the turning the key physically made contact with different wires?
The switch is activated by a pushrod/rack&pinion that transfers the rotary motion of the key into a linear motion for the ignition switch. With the addition of efi and high load devices, the ignition switches grew in size until it couldn't fit inside the tumbler area anymore. 8th Gen Ford trucks have 4 different circuits in them. 9th Gen trucks have 8 circuits, I believe.
https://automotorpad.com/ford/143475-how-to-replace-ignition-switch-1989-ford-f150.html
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Cross-Country
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From: highland us
OK thanks this what I was looking for, thank you Prototypemech. All the pics I was seeing ignition switch was low on the column..
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From: Mojave, Ca
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
your 90 has the ignition switch low on the column, about the area of the brake pedal. they sometimes separate causing a shut off on a bump issue.
more often though the ignition actuator breaks up top in the column. most times it breaks in a no start. but i have seen and repaired 3 that broke in a no shut off situation.
i am thinking your issue is a bad ignition actuator.
more often though the ignition actuator breaks up top in the column. most times it breaks in a no start. but i have seen and repaired 3 that broke in a no shut off situation.
i am thinking your issue is a bad ignition actuator.
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