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Here is the link to TB'r Vic's original post for showing how to change LMII jumpers along with actual photos of the amp's interior:
http://www.talkbass.com/forum/showpost.php?p=4363780&postcount=624
To answer your question, the DI jumper does NOT have 4 prongs! The jumper itself is a small, black removable clip that clips on to only TWO of the three prongs that are extending vertically out of the circuit board for the DI pre/post setting. It has no visible wires on it because the jumper wire is molded inside the clip. You'll see the words "pre" and post" in white letters right on the circuit board (they're also visible in the picture in Vic's post). This is where the DI jumper is located. The middle prong is always used. One prong is always unused, remaining exposed, just as in the picture.
Anybody got his hands on for a voltage conversion on the LM3? Is it done the same way as the LM2?