September 2017
Intermediate to advanced
700 pages
28h 19m
English
Content preview from Automobile Electrical and Electronic Systems, 5th Edition
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Lighting
445
The process of checking a lighting system circuit is broadly as follows:
1. Check battery (see Chapter 4) – must be 70% charged.
2. Check bulb(s) – visual check or test with ohmmeter.
3. Fuse continuity – (do not trust your eyes) voltage at both sides with a
meter or a test lamp.
4. If used, does the relay click (if yes, jump to stage 8) – this means the relay
has operated, it is not necessarily making contact.
5. Supply to switch – battery volts.
6. Supply from the switch – battery volts.
7. Supplies to relay – battery volts.
8. Feed out of the relay – battery volts.
9. Voltage supply to the light – within 0.5 V ...
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