x5 aux input weird problem

[mdeep1]

Hey guys, I've searched and searched and can't find an answer to this problem. I've seen one other member have the same problem, but nobody ever answered him. Basically, I'm trying to install an aux input by connecting the pins for the adapter into slots 3, 4, and 10. However, there are already pins in slots 3 and 4. I tried removing those two pins and then inserting the wires from the aux input, but the radio wouldn't turn on when I did this. Any ideas? Instead of having just two wires in the black 12-pin harness, I have four. I have no clue what to do.