02 ford f150 starting problems?

Put the key in ignition, lights come on, truck won't start. Just a buzzing sound from steering column area, not engine. Checked battery… Fine. Replaced ignition switch. Replaced starter relay. Still won't start when i turn the key… BUT… It will start if i use a jumper wire from positive battery terminal to exposed terminal on relay (removed push on connector - signal wire from the ignition switch).

What could be the problem?

The wiring going to the relay are fine. Not corroded at all.

If the starter works fine from the relay wouldn't it be logical that the problem lies between the key and relay?

Look at the terminal connectors to the relay. One or more could be burnt or corroded. Then check the wiring going to and from the relay.

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