My 1992 400e probably has the worn wiring harness problem. Periodically, it will slip into limp home mode, which can be cured by turning off the car and restarting it. Last night, while sitting at a stop light, it started the uneven idling and I turned off the car and restarted it, but when restarted it still had the uneven idle. I turned it off and tried to restart and everything went black. No power at all. No warning lights nothing in the middle of pretty heavy traffic. I had to sit at the light without any warning lights, or lights of any kind. You can imagine all of the cussing and honking that was directed at me. I had it towed to a garage and waiting for it to open on Monday, but I'm wondering if it is something relatively simple, like a fuse or some connection between the battery and alternator. The battery is less than 3 months old. Anyone have any ideas?

Thank you.