Three problems related to battery dead have been reported for the 1999 Ford Expedition. The most recently reported issues are listed below.
Our battery died because the air fan inside the car would not shut off. Once I got car jump started noticed that many electrical devices were either not working or turning on and off by themselves. These problems continued after I replaced battery. I took it to the dealership and was told that the windshield in 1999 Ford Expedition leaked causing electrical shortages in most electrical components in the car. And would cost $1000. 00 to fix and the windshield would need to be replaced for another $200. 00. After researching this I have found that this is a well known problem in this model but no recall has been established.
1999 Ford Expedition windshield leaks and shorts out electrical system. Happens when unattended often and turns on lights and other systems so battery goes dead. Had Ford dealer repair one year ago and problem has returned.
After going through a car wash electrical system on my 99' Ford Expedition started to malfunction. All gauges going back and forth violently many warning lights illuminating loud clicking and popping noises like shorting out noises in fuse box area. Battery died shortly after while in traffic heading home leaving me stranded could have caused an accident. Replaced old battery with new one and still experiencing electrical failures. Vehicle is still sitting to this day!.