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The actual problem is the starter continues to turn after key is turned off and pulled out of ignition.
Location of starter on 89 ford f150
Make sure the relay is supplying the 12 volts to the starter - if so remove the starter and go get a rebuilt on to replace it or learn how to repair it yourself.
Probes were not made until 1989
On the Starter
you will probably need a ball joint press and a splitter
were is the vin on the fram of a 1985 ford f150
How do you remove and replace the battery on a 2001 Ford F150?
C6
How to drill out ignition switch on 1985 ford f150?
1985-1988 ford f150 f250 and f350 or a 1994 f150 f250 and f350
Instructions are in the box the starter came with or go to the manufacturers web site. Not a fun job unless you've done them before & have access to wiring diagrams