Inspection
INSPECTION1. Visual and Aural Checks
Check relay operation, blower motor rotation, light illumination, etc. visually or aurally. The flow of current is invisible but can be checked by sight and sound.
2. Simple checks
For example, if a headlight does not come on and a faulty fuse or poor grounding is suspected. Replace the fuse with a new one. Or use a jumper wire to ground the light to the body. Determine which part(s) is/are responsible for the problem.
3. Checking with instruments
Use an appropriate instrument in an adequate range and read the indication correctly. You must have sufficient knowledge and experience to handle instruments correctly.