Yes, it has a tensioner. How am I supposed to know if that's bad though? Seems to be holding the belt! Would be a PITA to change though... It's really close to the inside of the fender. Alternator was my first thought, but the fact that it's just random stuff going out and coming back on, is kinda strange. I've had the alt go out on me before (about 80k miles ago) and when it went, I had everything go out on the car electrically... one thing at a time. All of the warning lights started coming on and the car ran and rode like crap. Then, I pulled into a gas station, left the car running to go use the phone, and by the time I came back out it was dead. I can't see how the alternator would cause stuff to randomly go off and come back on. Regardless, I will prob take it to Autozone over the weekend and have them run a couple diagnostics machines on it. I've been told they may even be able to tell if the ECU is what's going bad?