Hey Darren,
The silver can part in your picture is the delay relay. The two yellow wires feed one to the key light as mentioned and the other to the left side light bar bulb to light the switch panel. The brake pedal switch is just making a closure from the pink (power) to white wire and polarity doesn't matter. The square relay is the four way flashers and the mounting bracket connects to the passenger side of the ash tray frame. The three hole yellow socket is just an accessory power feed for something like a rear defogger, etc.
Slotts