Just to clear a few things up, here are a few pictures. First one is of the dual alternator belt routing, and the second one shows the primary belt tensioner. The lever at the bottom is what you flip up to hold the tensioner in the released position. The primary tensioner looks similar on both the dual alternator and the single alternator application.
If the lever happens to be missing, I think I recall someone saying an 8mm 1/4" socket would work in it's place.
Belt Routing for Dual Alternators
Closeup of Primary Tensioner
