Yesterday after work I went outside to start my car, no luck. Dead battery. Got it jumped, and on the way home my blinkers and fans did not work, so the alternator is not providing current obviously.

Thinking it was a bad alternator, I checked under the hood, and the belt was loose. Behind the alternator, the nut for the back of the tensioner fell off.

Soooo I need to find out what size of nut that is so I can go grab a new one. Im not talking about the tensioner itself, but the bolt that is behind the alternator holding in the tensioner.

Thanks for your help!