If it was APC it should have had instructions with it. That box is the relay. I don't really want to say anything about wiring since it could be different from what I'm thinking. Try APC's website first. After, the relays black wire is the gorund wire, you groud that, the red wire probably goes through a fuse to the battery. there should be connectors on the box, 2 of them. One connector goes to the switch through another fuse, and the last conector should go to the strobe bulbs and they themselves should be grounded. Be careful before you do anything. I've melted a LOT of switches and know that wiring something wrong leads to molten plastic.
If you've got pants on, you're doin' alright.
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