If you have a motorized antenna, use the blue lead from the tuner module to raise lower the antenna, and the blue lead from the sled to turn on/off amp...
Check the extension cable that goes between sled and tuner, wires should go 1to1, 2to2 etc, except the blue antenna lead (miswired extensions have been reported).

And tell them to not, under any circumstances, cut anything off, even if they don't know what it's for...

If you plan to have another sled+tuner, know what the ID is set to (the rotary 0-15 switch) on the tuner module.

/Michael