Super Old Fart Moderator
2002 ML320, 2005 S430 4MATIC RIP, 2010 F150 Crew Cab
If your hood doesn't have a routing diagram, make one before you start. Place a box end wrench of appropriate metric size on the bolt end of the spring tensioner pulley and release the pressure and slip the belt off with the other hand. Replace new belt by putting it on all pulleys before the tensioner, release tension by holding the pulley back with the wrench and slip new belt on. You may want to try releasing the pressure a couple of times to get the feel of it.