Key won't turn off engine
More Turbo
Joined: Feb 2010
Posts: 661
Likes: 6
From: parma
If you have power on the wire going to the solenoid for starting, then ignition switch is bad, or you've melted wires together in the plug that goes to the ignition switch. My 77 camper special did that. Ignition switch was bad, shorted out and melted the harness. I ended up with a used harness from a 79, and the ignition switch harness plug is different. Ford new they had a problem and beefed up the switches in 79. So you need to get switch out of dash and take a good look at the plug and wires connected to it.
Senior User
Joined: Jan 2015
Posts: 348
Likes: 0
From: Vidalia onion,GA
When I swapped the switch everything looked good with the plug. And I pulled the gauge cluster out to check on the wire harness to the switch and anymother visibles. Nothing melted. No red flags.
Elder User
Joined: Sep 2014
Posts: 862
Likes: 7
From: like subarctic, brrr man!
Faulty Starter Relay. If it's got that I terminal with factory plug, and you unplug that then the relay is at fault. If should only send power to the I terminal when relay is activated at start.
Later truck had this wire incorporated into the ignition switch to send full power to the coil.
Later truck had this wire incorporated into the ignition switch to send full power to the coil.
New User
Joined: Apr 2017
Posts: 1
Likes: 0
Truck continues to run when Key is turned off
I picked up a 2003 Expedition (5.4L) that has this odd problem. It will start just fine, but when you turn the key to the off position, it continues to run. To shut it off you turn the headlights on (when the key is removed), but the power is still on to everything. The only way to completely shut it down is to disconnect the battery.
I've swapped out the ignition module on the steering column. I've pulled the actual switch and it appears to function properly.
Any and all advice would be helpful. Thanks
I've swapped out the ignition module on the steering column. I've pulled the actual switch and it appears to function properly.
Any and all advice would be helpful. Thanks
New User
Joined: Apr 2020
Posts: 2
Likes: 0
I picked up a 2003 Expedition (5.4L) that has this odd problem. It will start just fine, but when you turn the key to the off position, it continues to run. To shut it off you turn the headlights on (when the key is removed), but the power is still on to everything. The only way to completely shut it down is to disconnect the battery.
I've swapped out the ignition module on the steering column. I've pulled the actual switch and it appears to function properly.
Any and all advice would be helpful. Thanks
I've swapped out the ignition module on the steering column. I've pulled the actual switch and it appears to function properly.
Any and all advice would be helpful. Thanks
Freshman User
Joined: Jan 2010
Posts: 26
Likes: 0
I pull my pcm relay to shut the truck off then the 203 relay buzzes. You ever figure it out? I may go get a new distribution panel/fuse box
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Tuned
Joined: Feb 2013
Posts: 421
Likes: 37
bump
What ever happened to this.
I just finished my build and now the truck will not turn off.
I went with a 3 wire gm alternator and pertronix distributor. The wire i choose to run the coil and electric choke both energize on/off with the key, Once the truck starts, it will not de-energize, Somehow getting voltage from the alternator. But the alt is very easy and i have used the same set up on other builds.
Thoughts?
Is it possible the exciter wire is generating 12 volts and feeding it back into my circuit? I have three wires from the old system, All are key on/off but whenthe engine is running they have 12 volts with the key off.
I just finished my build and now the truck will not turn off.
I went with a 3 wire gm alternator and pertronix distributor. The wire i choose to run the coil and electric choke both energize on/off with the key, Once the truck starts, it will not de-energize, Somehow getting voltage from the alternator. But the alt is very easy and i have used the same set up on other builds.
Thoughts?
Is it possible the exciter wire is generating 12 volts and feeding it back into my circuit? I have three wires from the old system, All are key on/off but whenthe engine is running they have 12 volts with the key off.
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