Good original 1984 Chevrolet Dealership Electrical Troubleshooting Service Manual Supplement. This Shop Manual Supplement gives information, illustrations, diagrams and procedures on servicing and diagnosing electrical problems with the Impala, Caprice, Malibu, Monte Carlo and El Camino Models. These are what the Dealership used to repair your car. Very informative and rare item that is a useful tool for the Chevy Owner.