Tow bar electronics - help asap

[feistl]

Hey guys, I need to know what configuration the electronics should be on my commodore. I went to tow a trailer for the first time last night and when i turn the headlights on all the lights on the trailer come on. I need to know which pins should put out what power. Its got one of those 7 pin connectors. Not the large older ones, but the smaller "20cent peice size" ones. Need help asap as i need to tow a car tomorrow morning. Cheers.

[hako]

Pin numbers :
1 ...left turn yellow 2...reverse black 3...earth white 4...right turn green 5...brake blue 6...stop red 7...tail brown

The brake refers to electric trailer brakes.