To diagnose a wiring problem on a Ford truck, first identify the specific problem. Common issues arising from wiring problems in a Ford truck include failure to start, malfunctioning interior lights and tripped circuit breakers. Other problems include failure of power windows, malfunctioning windshield wipers and blower motor problems.
Loose battery connections, a defective alternator or a blown fuse can result in the failure of a Ford truck to start. To fix this, ensure that the battery terminals are firmly connected. You may have to replace the alternator and the fuse. Corrosion in the wiring can cause failure of interior and dashboard lights to illuminate properly. Using anti-corrosion grease to coat exterior sections of connection surfaces resolves this.
Overloading the circuit or loose wire connections causes circuit breakers to trip. Moving the heavy power consuming devices to a different circuit, turning off the devices on the circuit and tightening the wire connections eliminates this. A faulty ground connection system, a blown fuse or low voltage can cause the power window locks to fail. To rectify this, do not hold down the lock or unlock buttons for too long to avoid blowing up the actuator motor.
A faulty wiper motor circuit board can result in the failure of the windshield wipers. Replacing the wiper motor resolves this. Failure of the blower motor in a Ford truck emanates from malfunctioning regulators. Replacing the fan blower motor and resistor helps to solve this problem.