Tools and materials:
* Electrical circuit tester
* Multimeter
* Screwdrivers (phillips and flathead)
* Wrenches (various sizes)
* Electrical tape
* Wire twists
* Soldering and soldering iron
Safety:
* Disconnect the car battery before starting work.
* Wear safety glasses and gloves.
* Be careful when working with electrical components.
Diagnosis of the problem:
* Use a circuit tester to check fuses and relays.
* Check the battery terminals for corrosion or looseness.
* Inspect the wiring for damage, kinks or loose connections.
Repair:
1. Replacing fuses and relays:
*Locate the faulty fuse or relay.
* Replace it with a new fuse or relay of the same rating.
2. Cleaning the battery terminals:
* Disconnect battery cables.
* Clean the battery terminals and cables using a wire brush.
*Apply anti-corrosion agent to the terminals.
* Connect the battery cables.
3. Repair of damaged wires:
* Identify the damaged section of the wire.
* Cut off the damaged area and twist the exposed wires.
* Insulate the twist using electrical tape or heat shrink tubing.
4. Solder connections:
* Strip bare wires.
* Solder the wires together.
* Insulate the soldering area with electrical tape or heat shrink tubing.
5. Other possible problems:
* Starter malfunction: Check the starter relay, wiring and contacts.
*Ignition system problems: Check spark plugs, ignition coils and wiring.
* Lighting system problems: Check bulbs, fuses, relays and wiring.
* Electrical problems: Check the alternator, battery and wiring.
Examination:
* After repair, connect the battery and start the car.
* Check the functionality of the repaired components.
*If the problem persists, contact a professional mechanic.