Possible causes of electrical problems preventing the car from starting:
Battery
* Discharged or weakened battery.
* Corroded or damaged battery terminals.
* Faulty alternator not charging the battery.
Starter
* Faulty or stuck starter.
* Damaged or corroded starter terminals and wires.
Ignition system
* Faulty ignition distributor or ignition control module.
* Worn or dirty spark plugs.
* Damaged or loose high voltage wires.
Power system
* Faulty fuel pump or filter.
* Clogged or rusty fuel lines.
* Faulty fuel or fuel pressure sensors.
Electronic Engine Management System (ECM/ECU)
* Faulty or faulty ECU.
* Damaged or corroded ECU wiring.
* Faulty engine sensors or crankshaft position sensor.
Other possible reasons:
* Broken or damaged main wiring harness.
* Faulty relay or fuse.
*Corrosion or damage to relay contacts and fuses.
* Short circuit or overheating of electrical components.
Diagnostics and troubleshooting:
* Check the battery using a voltmeter.
* Inspect the battery terminals and clean them for corrosion.
* Check the starter by tapping it with a hammer.
* Check spark plugs and high voltage wires.
* Check the operation of the fuel pump by listening to its noise.
* Scan the vehicle using a diagnostic scanner for trouble codes.
* Inspect the electrical wiring for damage or short circuits.
* Replace faulty components.
Precautions:
* Disconnect the negative terminal of the battery before performing any electrical work.
* Wear protective gloves and goggles.
* When working with electrical components, be careful to avoid short circuits.
*If you are unsure of your electrical skills, seek assistance from a qualified professional.