The relay wiring diagram for the relays is as above and you just add a fuse into both the2 power feeds from the battery (i.e. from the starter solenoid live connection) and a fuse in the line to each pair of lights.
It really is a very simple job, just make sure you run the wires neatly and clip them back to the existing wiring loom. The fuse box can go on the front bulkhead in the engine compartment, fitted with 2 self-tapping screws.
A relay is simply an electrically triggered switch which won't burn out when carrying a high current. So the two toggle switches just take the signal current, from the main beam circuit for the spotlights and from the ignition 'live' side for the fog lights.
Edited by Cooperman, 24 April 2013 - 02:56 PM.