One problem related to battery cable has been reported for the 1999 Ford Explorer. The most recently reported issues are listed below.
Upon starting the car, the left turn signal remained lit solid on instrument cluster and smoke poured from the steering column. Smoke continued after key was removed in "off" position. Was concerned that fire would start. Disconnected battery cable and towed truck to dealership. Dealer inspected and replaced multifunction switch and wiring harness. Dealer said harness connector was cracked.