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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 07-01-2008, 09:27 PM
AlChalmers10 AlChalmers10 is offline
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F-150 starter won't disengage

I have a 91 F150 with a 300-6 and a five speed. Went to start it tonight and it started fine, but the starter would not stop cranking even when I turned the truck off. Had to pull battery cables, but starter was fried before I could get cables off.
My question is, would that be a bad ignition switch or a bad starter, or both? I know I have to replace the starter, but will I also need an ignition switch? If so, where do I find it on the truck, how do I replace it, and any idea of cost? Any help would be appreciated. Thank you very much.
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Old 07-02-2008, 01:03 AM
MisterDave2 MisterDave2 is offline
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Hey Al, welcome! I don't have a 91 but wiring is kind-of up my alley. Probably the solenoid arced or burned shut, staying closed way to long, doing it's job too good. I think it's next to the battery, can't find my Haynes book, but your local AutoZone etc. should be able to help you with that or do a search here. I doubt if it's the actual column key switch, but it's possible. Also, maybe the starter is actually still good but just overheated, don't know if it has a thermal switch inside to shut it down. Just be careful because all this stuff runs hot power right from the battery so keep the battery disc. until you're better sure what's going on.
2008 F-150XL 2x4 V6 Silver, 8' bed, 54,500 mi.
2008 F-150XL 2x4 V6 White w/mid box 115,000 mi.
(my son's truck) posi rear & mid box, 5'6'' bed
1995 F-150 4x4 I6 Green 249,150 mi. RIP :-((
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Old 07-02-2008, 01:47 AM
88n94 88n94 is offline
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I agree with MisterDave2, it's probably the solenoid. It wouldn't have been a bad starter in the first place, as the starter has to get it's power from somewhere. The solenoid should be behind your battery, it's what the other end of your positive battery cable connects to.
88 F=150 4X4 4.9l 5speed. 94 F-150 4X4 5.8l automatic overdrive.
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Old 07-02-2008, 07:17 AM
Lazy K Lazy K is offline
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Before you install a new starter or reconnect your old one you must find out what the problem is. The other guys could well be right. However there is the possibility that the problem lies with your ign./start switch. This switch is on top of the steering column under the dash. With the battery disconnected put a multi-meter across the two big terminals on the starter relay (this is on pass. side inner fender as mentioned in other posts) the meter should read an oped circuit. If it reads a direct short then the relay is bad. If the relay checks out good unplug the small gauge wire from the relay and reconnect your battery. Using a volt meter or test light see if you have 12v between that wire and ground. If you have then your ign./start switch is faulty. Hope this helps.
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Old 07-02-2008, 07:17 AM

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