Use a test light or a multi-meter to check for power going through the switch when it's depressed or for ohms depressed.
Is your clutch pedal depressed? If it is, check switch on clutch pedal.
The F150 uses a safety switch on the clutch system. The switch is under the dash on the clutch pedal arms. If the switch is bad, then the engine will not start.
Check for power at the clutch switch, then check for continuity through the switch with the clutch pedal depressed. If there is power and continuity, then the starter (or even ignition solenoid/starter relay) is the problem.
Either your starter solenoid, if not check the neutral safety or clutch safety switch.
There is a clutch switch under the dash attached to the clutch pedal. This switch interrupts the start position of the ignition key, often this switch, or something in the circuit goes bad not allowing the starter to get the power it needs to start. Also check that you're starter solenoid is good. K6 Mazdatruckin.com
CHECK THE CLUTCH SWITCH TO SEE IF ITS FAULTY. MAKE MAKE A JUMPER WIRE TO SEE IT THAT'S THE PROBLEM. MAKE A JUMPER WIRE WITH AN INLINE 20 AMP FUSE. UNPLUG THE ELECTRICAL CONNECTOR TO THE CLUTCH SAFETY SWITCH. PUT THE JUMPER WIRE IN PLACE OF THE SWITCH. NOW PUT THE CLUTCH IN AND TRY TO START IT,IF IT STARTS THEN BUY A NEW SWITCH. THE CLUTCH SAFETY SWITCH IS UNDER THE DASH ABOVE THE PADDLE,LOOKS LIKE A LITTLE CYLINDER. GOOD LUCK
it is under the dash at the top of the clutch pedal.it is the same as the clutch start switch
check park / neutral safety switch, if standard trans check the clutch safety switch
its on the backm of the clutch pedal its about 2 inches long
DO YOU MEAN THE NEUTRAL SAFETY SWITCH?
Stand safety switch or clutch switch
The clutch start switch is bad.you will find it at the top of the clutch pedal