The Hyundai Sonata is a mid-size sedan manufactured and marketed globally by Hyundai Motor Company since 1988. The first generation of Sonata came with 2 trims level, the GL (2.4 and 2.0 engines) and the GLS (3.0 engine).
The following article discuss the entire electrical system of Hyundai Sonata which is consists of charging system, starting system, ignition system, and auto cruise control system. The charging system includes a battery, an alternator with a built-in regulator, and the charging indicator light and wires. The alternator has six built-in diodes (three positive and three negative), each rectifying AC current to DC current. Therefore, DC current appears at alternator “B” terminal. In addition, the charging voltage of this alternator is regulated by the battery voltage detection system. The main components of the alternator are the rotor, stator, rectifier, capacitor, brushes, bearings and V-ribbed belt pulley. The brush holder contains a built-in electronic voltage mater.
In this article, you will find also electrical system specification, tightening torque, and troubleshooting of each electrical components of the Sonata.
Find more information about 1991 Hyundai Sonata Engine Electrical System – Troubleshooting here – 8.61MB PDF file. (source: tech.mirage-performance.com)
Find also Hyundai Sonata Engine Wiring Harness Layout here – 811KB PDF file.