I was researching this problem. After replacing the starter and solenoid, I still had the same problem. Someone suggeste the switch could be sticking. I sprayed liquid wrench into swith on column and problem is solved. Thanks to whomever makd that suggestion. I am passing this along, cause it could happen to you.
on bottom side of engine
A starter will not disengage if the ignition switch is stuck or if the solenoid has jammed. This will cause the starter to constantly receive power.
Disengage - album - was created in 1998.
a bad battery will do this. also make sure the correct shims are used in installation and that the number of teeth on flywheel and starter both match. either of these can make starter hangup and not disengage
your ignition switch is hanging up in the crank position.
The starter drive (also called bendix) is not dis-engaging after the key start position is released. Probably due to dust/grime build-up, gear sticking to flywheel, or just going bad.
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starter is out, motor is locked up or your starter solenoid is out.
Location of starter on 89 ford f150
Disconnect the battery...
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On the Starter