Diagnostics
* Check the battery and its connections.
* Check fuses and relays.
* Use a multimeter to check voltage, current and resistance at various points in the electrical system.
*Use a diagnostic scan tool to identify trouble codes.
Repair
Battery and Connections:
* Replace or recharge the battery.
* Clean and tighten battery connections.
* Check for corrosion or damage.
Fuses and relays:
* Replace blown fuses.
* Check and replace faulty relays.
* Check for damage or loose connections.
Wiring:
* Repair or replace damaged or burnt wires.
* Insulation of exposed wires.
* Checking grounding points and cleaning them.
Generator and starter:
* Replace faulty alternator or starter.
* Check the alternator belt and adjust its tension if necessary.
* Clean and tighten the alternator and starter connections.
Lighting:
* Replace burnt out lamps.
* Check and replace faulty lighting switches and relays.
* Clean and tighten lighting connections.
Ignition system:
* Replace spark plugs.
* Check and adjust the spark plug gap.
* Check and replace faulty ignition coils.
Electronics and sensors:
* Replace faulty engine control modules, sensors and actuators.
* Check and repair damaged wiring harnesses.
* Calibrate sensors and actuators to specifications.
Prevention
* Check the electrical system regularly for signs of damage or wear.
* Clean and lubricate electrical connections periodically.
* Protect the electrical system from water and corrosion.
*If necessary, use a voltage stabilizer.
* Seek qualified assistance in case of complex or malfunctions.