Electrical Connectors, under dash

I need some help identifying some connectors under the dash.

Its a transplanted harness from a 1991 XJ into an 87 MJ.


Black connector, 4 pin (heavy gauge wire)
yellow plug, coming from steering column.
White 2 pin connector (Wh/Bk goes to fuse panel, Wh/Pk goes to break switch, va an adapter)
Black connector, 4 hole, with 3 wires
Blue connector (fits the break switch too, but is not connected)

And if anyone knows, what is the "red" relay?




Thanks!

blue.. auto transmission diag connector.
yellow. cruise switch

large black ... rear defog relay *i think*

small black for cruise as well.. *i think*

white.. ?