SCARY Ignition Problems
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New User
Joined: Jul 2010
Posts: 3
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From: Nashville
SCARY Ignition Problems
I have a '73 dentside that has a mind of it's own. The latest problem is intermittent. Sometimes when you start the truck, you hear that the starter motor and flywheel continue spinning (won't disengage when key released to the "Run" position.) Additionally, if you turn the key to "Off", the engine and starter keep running. Pulling the key out - still runs...You have to go pull the battery cable to get the truck to turn off. If you touch the battery cable back to the battery post - the truck starts without a key.
I thought it might have been an ignition switch issue, so replaced it and it seemed fine for a few days until today. Same problem as before.
The starter solenoid is a new Motorcraft. The solenoid positive post only has the battery cable, horn relay wire, and main harness wire connected like it should. Other electrical things replaced in the past month, Motorcraft voltage regulator, battery cables, horn relay.
I've checked the entire harness for problems, pulled the dash and checked all connections etc. I can't think of anything that would cause this. Any ideas?
I thought it might have been an ignition switch issue, so replaced it and it seemed fine for a few days until today. Same problem as before.
The starter solenoid is a new Motorcraft. The solenoid positive post only has the battery cable, horn relay wire, and main harness wire connected like it should. Other electrical things replaced in the past month, Motorcraft voltage regulator, battery cables, horn relay.
I've checked the entire harness for problems, pulled the dash and checked all connections etc. I can't think of anything that would cause this. Any ideas?
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
It sounds like the solenoid is sticking. To check it, if it wants to keep cranking over without the key in the start position. When it's cranking disconect the small wire marked "S" on the solenoid. If it stops cranking you have a wiring problem. If it keeps turning over the solenoid is sticking.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
That's probably the most common problem with our trucks. The truck isn't the problem, the PO's handiwork is the problem.
