Two problems related to alternator/generator/regulator have been reported for the 2008 Jeep Wrangler. The most recently reported issues are listed below.
As the vehicle was travelling at night on a two-lane country road at 35 mph, the electrical power of the vehicle shut off, including headlights, radio, interior power, ventilation, and engine. The duration of the outage was approximately 10 seconds. This power outage occurred just prior to a curve and caused loss of vision and abs braking, causing a skid and narrowly missed colliding with a guardrail. The power then came back on, and all systems appeared to return to normal. There appears to be a power distribution problem that affected the operability of the vehicle, creating a hazardous condition. Battery and alternator check out ok, so a power supply problem is not a root cause of the issue.
Car parked and stationary at home. Opened the rear door (with keys in hand, not in ignition) and the front windshield wipers started going and the running lights came on. After 1-2 minutes the horn started blowing and the heater blower motor came on. Putting the key in ignition or not made no difference. Pulled the positive terminal off of the battery and everything stopped. Reconnected the positive terminal and nothing unusual happened. Tried starting the car to test and the key activated the dash but would not start the engine but normal dash lights came on. While trying different things (shift to neutral, park, on, off, etc) the wipers (front and rear), blower, running lights and horn all came back on and the engine started without turning the key from run to start. Wipers and blower speed changed without touching any controls. Blower speed could be changed through switch, but when blower switch turned to off, blower went to high speed. Pulled positive terminal and negative terminals from battery with no change ¿ everything still running. Had to pull wires off the alternator to stop everything. The heater blower had stopped on this vehicle a year or so ago and after testing and replacing all blower parts with new parts it was determined that the tipm was at fault. Tipm has not yet been replaced (but will be). If this had happened while the vehicle had been in motion, it would have (at the very least) panicked the driver. I am going to reconnect the battery and attempt to video the results.