Wiring Connections

[neatoldstuff]

OK..I thought I had a pretty good handle on all the wiring connections when I removed the steering column from my '87 Silverado. I discovered quickly during the install that I couldn't figure out two of the connections. So, I'm looking for a little help. One connection is for the horn. I have a black wire coming out of the column but for the life of me I can't find the connection. I have another black connector with a white lock on it and I can't seem to find where that one goes either. I think this one might be for the idiot lights. If anyone out there cares to reply I can supply pictures of these two connections. Thanks.