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A weak battery will make the lights come on & energize the solenoid for the starter, but the battery is too weak to make the starter motor turn. Checking the battery would be first, the solenoid second.
If no movement of the engine happens at all, then please check the following:
1) Battery voltage. You should have 12.5 volts and over. Try turning on the headlights and cranking. If they dim considerably, then your battery is likely flat and may need charging/replacing.
2) Battery voltage is fine, but nothing happens: Is there a clicking when you turn the key? If so, then check the starter motor. It's likely failed.
3) Battery voltage is fine, but there is no clicking when I turn the key. Check voltage to the starter motor solenoid on the top of the motor. If it is receiving power when you turn the key to crank, yet not moving/engaging, then replace it.
4) Battery is fine, but no power to starter motor and/or solenoid. Check all battery connections, leads and connections to the motor and engine body.
If the battery is charged and the cables are clean, you are probably hearing the starter solenoid on the starter trying to engage. If the starter can not be jumped directly, I would agree the starter is faulty.
Fords require 10 + volts to activate the solenoid. A faulty solenoid, weak battery, or bad connections can cause the solenoid to click. Especially a battery with a dead cell that looks like it is charged. If the solenoid is clicking the neutral safety switch is ok. If you are only hearing relays click, take a test light and check the 16 gauge wire on the solenoid for voltage with the key in start position. Also jumper that post with the battery post on the solenoid to crank the engine.
Check the wire harness to the starter solenoid, the wires could have a break in it or the solenoid could also be bad. The heat of the engine could be causing the solenoid to fail till it cools down. Try that first, good luck and keep me posted, be glad to help.
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