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Diagnostic procedures for the check engine and service engine soon light with trouble code descriptions and test procedures.

Covers basic electrical issues, alternators, relays and circuitry.

Battery maintenance, myths, electrical testing, jump starting, failure and replacement are all discussed.

Photographs and animations describe the unusual device called a thermal flasher that makes your signals flash, and shows how turn signals cancel themselves after you've made your turn.

Dedicated to helping the home and independent technician understand and use OBD-II technology through text, photos, and a discussion forum.