Visual inspection:
* Check cables and wires for damage, cracks and burns.
* Inspect the battery terminals and connections for corrosion and looseness.
* Inspect the connectors for rust and dirt.
Voltage tester:
* Use a voltage tester to check for power at various points in the circuit.
* Using the positive probe, touch the point where power should occur, and use the negative probe to touch ground.
* The tester must show the appropriate voltage.
Multimeter:
* A multimeter is a more advanced tool that can be used for:
* Voltage, current and resistance measurements.
* Checking the integrity of circuits and searching for breaks.
* Diagnostics of the operation of the generator, starter and other electrical components.
Trouble code scanner:
* The fault code scanner can read fault codes stored in the vehicle’s on-board computer.
* Trouble codes may indicate specific problems with electrical systems.
Other methods:
* Light bulb test: Use a light bulb in the socket to check for power in the circuit. If the lamp lights up, then there is power.
* Beeper Test: Use a multimeter with a beeper to look for open circuits. If the multimeter beeps, it means a break has been found.
* Spark Test: Use a special tester to check the spark on the spark plugs. A weak or missing spark may indicate ignition problems.
Precautions:
* Take precautions when working on vehicle electrical systems as they can be very dangerous.
* Always disconnect the negative terminal of the battery before starting work.
* Wear protective gloves and goggles.
*If you are unsure of your skills, consult a qualified electrician.