Well the SH-48 directions leave quite a bit to be desired also. Your best bet is to look at what pics there are, the parts, and the trunk itself and try to figure out how it goes. I am Florida right now, so unfortunately no pics for ya'll. If it helps, from what I recall:
1) Wires attach to light. You have some choice here as to which wires, the directions (not), luck (maybe), or some insight will tell you which one to choose.
2) Wires from light through top of case attaching to two stainless metal spring pieces (through some channel built into the case) via two small screws. These metal clips will be attached to the upper lip of the bag. There are all sorts of screws in the bag, choose two that seem appropriate, probably should be the same size at least.
3) On the bottom lip, two straight stainless metal pieces, that contact the above metal pieces, are attached to wires using two more small screws chosen as above. This wire runs to the bottom of the case.
4) Now you want to get juice to the case through the wires in step 3, this comes from the rack on the bike. On the 48 the wire in step 3 runs down through a small channel to a small plastic block in the bottom of the case. On the front edge of this block there are two small holes to pass a bolt through, these bolts will attach the wires inside the case to wires on the outside. The complication is two-fold:
a) There is absolutely no space to get those tiny impossible-to-hold-on-to bolts through. This part takes some mild patience.
B) Worse, the holes I mentioned above are not actually there. What you need to do is find the [SIZE=8pt]small[/SIZE] indentations where they should be. An awl will quickly produce the desired holes.
5) Wire some more stainless contacts to the bottom of the trunk, run brake light power to the metal contacts you cleverly put on the rack on the bike and off you go.
Annoyingly, those directions are probably twice as good as the ones that came with the trunk. Good luck!
