Question about 1991 Ford F250
Hey there Krabbe,
Since you are considering changing the ignition switch, I'm going to assume an above average mechanical ability on your part.
Sight unseen, I'd check the starter and solenoid first. They are easy to prove/disprove as the problem. The procedure for replacing the ignition switch is much more involved.
The solenoid on a Ford is usually near the battery and easily accessed. It has two heavy cables and a thinner gauge wire attached to it.
Before doing any testing, make sure the transmission is in Neutral or Park with the Parking Brake on.
Applying +12V to the terminal the thinner wire is attached to should engage the solenoid and cause the starter to crank the engine. You can use a small jumper (alligator clip type).
If the starter engages, you were right. Next stop the ignition switch. I'll get the replacement procedure written up for you.
If the Solenoid gives a solid CLICK, but the starter doesn't spin, use a screwdriver to short the two heavy solenoid terminals. If the starter spins up now, the solenoid is the problem. If not, it's the Starter.
The way we proceed depends on the results though. Please respond with what happened with the test. I'll get you going.
Posted on Aug 31, 2008
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