A Ford Super Duty may have starting issues for a number of reasons. These problems could be located in a few general areas within the engine.
If the Super Duty makes a clicking noise, the battery has likely lost its charge. The battery itself may be dead, but cables or battery components may also be to blame. Look at the positive and negative cables and ensure they are securely attached to the battery. White powder is often a sign of corroded battery terminals.
A Super Duty may not start completely if the electrical wiring is wet. Wiring is also attached to all major components and could pose a problem if damaged, frayed, loose or detached. Damaged or dead relays can disrupt the electrical system. The easiest electrical issue is a fuse box; burnt-out fuses can easily be replaced.
The Super Duty cannot function without fuel. However, this goes beyond an empty tank. Any water in the Ford's system poses a problem, as do fully or partially flooded carburetors. Gas needs to be able to reach the Ford's fuel injectors and pumps. Problems with the fuel system's filter can also immobilize the vehicle.
If the Ford overheats and is hard to start while hot, check and then change the air filter. Also, investigate the starter motor and pinion and service as needed. A malfunctioning alternator may need to be repaired or replaced.