1989 Ford F-150
I put a new starter in a 1989 F150 and now
it just humms loudly when I turn the key,
but doesn't start. Did I put the starter in
That sounds like the solenoid is not operating properly. Rebuilt starters are often times junk especially if you bought it at a store like Pep Boys. I would remove it and test it.
First check the cable between starter and positive post second check the the small connector on solenoid .then make sure about battery cable connection .
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