Two problems related to dash wiring have been reported for the 1999 Hyundai Sonata. The most recently reported issues are listed below.
Alternator went out which made the electrical system to go out. Entire dashboard was not working, also, abs brakes and engine check lights kept blinking. There was an electrical smell. Dealer replaced alternator.
While driving at various speeds vehicle would start to jerk. Would need to downshift to compensate for jerking. Would stall out intermittently. Guages would stop working. Have taken vehicle to dealership, and was informed by mechanic could not locate cause of problem. Mechanic did not test drive vehicle.