theres 5 wires in a bundle from my last diy..
exterior - jdm taillights and fog light installed
its red - source
dark green - brakes
lightish tinge green/white - not sure
orange - fog
black - ground
i was doing the mod myself a while back, when i was testing each wire, i found out when i wired the dark green for brakes, the way you wire is that it
the 3rd parking brake will find that circuit first, therefore when you turn on your parking lights, you might notice your 3rd break light on (as opposed to pushing the brake to see the light)
you can fix this buy purchasing an extra relay, i know simota did this and some others but i was too lazy and impatient to buy the part lol...
but those who wired the dark green was a problem for many fog light installers... (4 lights on for no reason)
you can tap the red wire and ground the black. just splice the fog lamp and save the connector.
thats what i did and it now functions as a backup light whenever i switch the stalk to parking lights or headlights to ON.
whats even better as a bonus, when i press the brake you can see the 3rd light turn on as well as the fog light turn brighter as well.
^_^ hope that helps.