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Why won't my 91 F-150 crank over?

3K views 1 reply 2 participants last post by  thefonz 
#1 ·
My 91-F150 won't crank over. When I turn the key it doesn't even click - only a faint hum. The battery tested good. I replaced the clamps to the battery terminals, checked the ground, and replaced the solenoid - still no go.

I jumped the solenoid with a screwdriver and it turned over, but didn't fire, so I'm sure the starter is ok. I'm puzzled. Any thoughts?
 
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