If you purchased an OEM trailer harness then this article really isn't any use to you as it will be plug n play. But for those that have purchased a generic 7-PIN harness from you local auto store here is some easy reference guide.
Whilst seeking an alternative look for under the bonnet and not wanting to have too many colours (I already have a blue theme going) I decided to go stealth like on the inlet manifold.
If you have a Subaru WRX or STI fitted with a "factory alarm system" or a "keypad" system there is a very good chance it is a Brandt. The following is the user's manual that most of us were supplied with when we purchased our Subaru.