The Haynes Techbook Automotive Electrical Manual 10420 is a comprehensive nonfiction book authored by John Haynes, focusing on automotive electrical systems. Published in 1990 by Haynes Manuals, Incorporated, this trade paperback manual is illustrated and contains 242 pages filled with essential information for automotive enthusiasts and repair professionals. With a publication year of 1990, this book is a valuable resource for understanding and maintaining automotive electrical systems, making it a must-have for anyone interested in transportation and automotive repair and maintenance.