There is only the alternator for a tensioner. There is a tension pully but it doesn't have any adjustment or spring tension. Remove the alternator guard by taking out two bolts. Loosen the pivot nut on the front of the alternator and loosen the adjusting bolt on the side of the alternator until the alternator is all the way back towards the engine. Slip the new belt on the alternator pulley, A/C pulley (if you have A/C) and craqnk pully, pay attention to the belt routing as indicated on the sticker on the hood! Slip on the idler pulley last and it will go right on. If your belt is too loose chances are you aren't following the correct belt routing. If you can't get the belt on you are not putting the idler on last.