So last night I jumped in my 08 WK 3.7L and started it up. I noticed my EVIC trip odometer, and mileage was reset as if I had disconnected the battery. Whatever, the Jeep started and it's 2AM, time to head home. I start driving down the street and my headlights start dimming/flashing. That includes my HID headlights which are powered directly from the battery via a relay, and my halogen fogs run through the factory wiring harness. I pull over, turn it off and restart, and back to normal.
Any ideas? I figured if I shut it off and it didn't start up again, it'd probably point to an alternator issue. The Jeep has 39k miles, original battery and alternator, and I haven't seen any warning lights on the dash, nor have I run the battery down.
2015 Jeep Grand Cherokee Limited
2016 Volkswagen Tiguan S
2008 Jeep Grand Cherokee Laredo