Inspection

1. Sight and sound checks
Check relay operation, blower motor rotation, light illumination, etc. Listen for a "click" when relay covers are pushed down.




2. Simple checks
For example, if a headlight does not come on, 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.