deer-fear-me27

okay on my 78 f250 custom i have 2 extra wires around my ignition modular... i think 1 of them is to my wiper fluid bowl but the other is one of those square ones, with 4 or 6 prongs in it but i cant find the other end to plug it in to any ideas of what it is for(and it isnt one of the wires going to modular all of those are plugged in.)?????