Tools and materials:
* Multimeter
* Indicator screwdriver
* Circuit tester (optional)
* Wrench or ratchet
* Screwdrivers
* Electrical tape
Procedure:
Precautions:
* Disconnect the negative terminal of the battery before starting work.
* Wear safety glasses and gloves.
Battery check:
* Inspect the battery for leaks, corrosion or damage.
*Use a multimeter to check the battery voltage (should be around 12.6V when fully charged).
* Check the battery terminals for looseness or corrosion. Tighten them if necessary.
Starter check:
* Check the starter terminals for looseness or corrosion. Tighten them if necessary.
* Turn the key to the “Start” position. Listen for a clicking or buzzing sound indicating the starter engages. If nothing happens, check the power to the starter using an indicator screwdriver or a circuit tester.
Wiring check:
* Check wiring for damage, fraying or corrosion.
* Use a circuit tester (or indicator screwdriver) to check the wires for continuity and shorts.
* Check wire connections for looseness or corrosion.
Checking fuses:
* Open the fuse box.
* Examine each fuse for blown filaments.
* Replace blown fuses of the correct rating.
Lighting check:
* Turn on all lights (headlights, side lights, turn signals, brake lights).
* Check if all lights are lit correctly.
* Check lamp terminals for looseness or corrosion.
Electronics check:
* Check the operation of gauges, stereo, air conditioning and other electronic components.
*Check for any warning messages or trouble codes.
Final stage:
* Connect the negative terminal of the battery.
* Start the engine and check all electronic systems again.
* If any problems are found, contact a qualified mechanic for further diagnosis and repair.