Hi Kevin , you dont disconnect the brown wires from the fuse box , all of the brown wires are connected together via a single ring connector about 8" away from the fuse box & is held on by a single nut or bolt that is covered by a rubber terminal cover , so no need to cut the wires at all . Regards Paul .
Paulus The Wood Gnome .
1988 Jaguar 3.6 .
2000 Range Rover P38 DSE daily driver .