E350 Ignition Wiring
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Cross-Country
Joined: Aug 2001
Posts: 63
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E350 Ignition Wiring
Still working on my 1988 E350 motorhome with 460 EFI engine. Will replace the faulty ignition switch tomorrow, old switch will not crank the motor and I have to jump the solenoid manually to do that. The old switch also seems to be stuck in the "ignition on" position too as all I have to do is jump the solenoid to get it running. Turning the ignition switch with the key does absolutely nothing. This probably explains the substantial arc I get at the pos battery terminal when connecting the bat cable even with the ignition switch turned off. Current going through the pos cable seems to be around 15 amps with everything shut off. Not good.
Subford attached some great wiring diagrams for this vehicle on my earlier posting regarding solenoid problems. The most useful one showed the green lead attaching to the pos solenoid terminal which supplied voltage to the alternator and accessories via the fuse block. But it did not show how the ignition wiring fits into the whole picture.
I am hoping that Subford or someone else can provide a schematic showing the power distribution from the solenoid pos including the ignition circuit. Thanks in advance.
Randy
Subford attached some great wiring diagrams for this vehicle on my earlier posting regarding solenoid problems. The most useful one showed the green lead attaching to the pos solenoid terminal which supplied voltage to the alternator and accessories via the fuse block. But it did not show how the ignition wiring fits into the whole picture.
I am hoping that Subford or someone else can provide a schematic showing the power distribution from the solenoid pos including the ignition circuit. Thanks in advance.
Randy
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Sounds more like you have a problem with the key tumbler or column linkage and NOT the Ignition switch.
Thinking 460 (7.5L) engine.
Other thread:
https://www.ford-trucks.com/forums/1...g-problem.html
/
Thinking 460 (7.5L) engine.
Other thread:
https://www.ford-trucks.com/forums/1...g-problem.html
/
Thread Starter
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Cross-Country
Joined: Aug 2001
Posts: 63
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Thanks for the diagrams Subford. Those will really help if I have to dig into this further.
The key mechanism on the steering column seems to work fine. Now to check if the actuation rod is doing what it is supposed to do. It looks like the steering column was lowered once for repair by the PO so I will check the rod out. It may be bent or something.
Happy 4th!
Randy
The key mechanism on the steering column seems to work fine. Now to check if the actuation rod is doing what it is supposed to do. It looks like the steering column was lowered once for repair by the PO so I will check the rod out. It may be bent or something.
Happy 4th!
Randy
New User
Joined: Apr 2022
Posts: 1
Likes: 0
Still working on my 1988 E350 motorhome with 460 EFI engine. Will replace the faulty ignition switch tomorrow, old switch will not crank the motor and I have to jump the solenoid manually to do that. The old switch also seems to be stuck in the "ignition on" position too as all I have to do is jump the solenoid to get it running. Turning the ignition switch with the key does absolutely nothing. This probably explains the substantial arc I get at the pos battery terminal when connecting the bat cable even with the ignition switch turned off. Current going through the pos cable seems to be around 15 amps with everything shut off. Not good.
Subford attached some great wiring diagrams for this vehicle on my earlier posting regarding solenoid problems. The most useful one showed the green lead attaching to the pos solenoid terminal which supplied voltage to the alternator and accessories via the fuse block. But it did not show how the ignition wiring fits into the whole picture.
I am hoping that Subford or someone else can provide a schematic showing the power distribution from the solenoid pos including the ignition circuit. Thanks in advance.
Randy
Subford attached some great wiring diagrams for this vehicle on my earlier posting regarding solenoid problems. The most useful one showed the green lead attaching to the pos solenoid terminal which supplied voltage to the alternator and accessories via the fuse block. But it did not show how the ignition wiring fits into the whole picture.
I am hoping that Subford or someone else can provide a schematic showing the power distribution from the solenoid pos including the ignition circuit. Thanks in advance.
Randy
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