Keeps turning over when Key is off?
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Senior User
Joined: Aug 2014
Posts: 185
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From: Olanta, PA
Keeps turning over when Key is off?
Ok, I am getting ready to start doing some trouble shooting this weekend... I just brought my new project truck home. The previous owner said that when he last tried to start the truck it was cranking, even after he turned the switch back to the off position. He disconnected the battery to keep it from hurting itself.... so off the top of my head I am thinking new key cylinder. Maybe a relay.... I had an 84 F250 that did the same thing, any ideas?
If it is cranking I am thinking the solenoid is good, starter is good....I haven't had a chance to tinker yet....But I am trying to think it through before I do...
If it is cranking I am thinking the solenoid is good, starter is good....I haven't had a chance to tinker yet....But I am trying to think it through before I do...
Laughing Gas
Joined: Nov 2013
Posts: 871
Likes: 6
From: Orcas Island, WA
Most likely place to start is the solenoid. Use a multimeter and see if you have continuity between the two large terminals. If so, it's fused internally and needs to be replaced.
Search the forum here and you'll find lots of discussion about this. First, by a quality replacement solenoid, not Chinese junk. Second, review your high amperage wiring and connections. If your positive and/or negative wires or terminals are corroded replace them before hooking the battery back up.
Search the forum here and you'll find lots of discussion about this. First, by a quality replacement solenoid, not Chinese junk. Second, review your high amperage wiring and connections. If your positive and/or negative wires or terminals are corroded replace them before hooking the battery back up.
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
The starter solenoid is a possible cause and could be sticking. Usually an easy way to tell is giving it a whack while it's doing what you told us. Loose the positive battery terminal so you can remove it by hand if required, then have a friend turn the engine. Just as the engine starts hit the solenoid (more like a strong tap), you can use a light hammer to do so. If it disengages you can tell for sure it's the solenoid, if not, be ready to disconnect the battery and keep diagnosing. (just read you tested the solenoid)
Since the solenoid is working, you might want to check two other possible causes, the starter bendix and the starter switch in the steering column, I've never worked on neither, so I have little to say on both.
Since the solenoid is working, you might want to check two other possible causes, the starter bendix and the starter switch in the steering column, I've never worked on neither, so I have little to say on both.
Laughing Gas
Joined: Nov 2013
Posts: 871
Likes: 6
From: Orcas Island, WA
A completely fused solenoid will not release with a tap of anything short of a shaped thermite charge. And if it is only "a little bit" damaged and releases with a tap, you still want to replace it before moving on to something else.
The solenoid is the simplest thing to eliminate so start there.
The solenoid is the simplest thing to eliminate so start there.
Cargo Master
Joined: Jan 2004
Posts: 3,118
Likes: 149
From: South Dakota
You don't say what year your project truck is. Assuming it is an F series, The answer would be a little different on a 1991 or older as opposed to a 1992 or newer. It's pretty easy to troubleshoot a constantly turning starter situation once you understand how the system works. What year and model is it?
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Mountain Pass
Joined: Nov 2004
Posts: 215
Likes: 0
From: nj
i have had starter relays burn themselves on but it also burned up wire at the same time. the other thing if the Bendix is bad in the starter it will keep spinning after you let go of the key
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