Yesterday while sitting in stop and go traffic my '95 LS momentarily dropped dead. Not only did the motor shut down but ALL powered devices, clock, compass/ thermometer and radio for like 3-4 seconds.Afterwards had to reset radio stations and clock. I whipped it into park and cranked and everything came back as suddenly as it had stopped. Put a real rush in me since I would have been blocking all these people if it had been permanent. My question is alternator? ECU? I want to fix it before it happens again and doesn't come back at all this time.

1995 Montero LS, KYBs, Michelin 31s. 2009 Kia Borrego EX. (Wife's wheels.)