wiring diagram for turbo timers

[D8MOA]

hi got a turbo timer with a supra loom but it has a purple and 2 black wire loose, for what i can rember the purple goes to the handbrake wire and the 2 blacks go to a ground?? is this correct? i cant rember what model it is but think its got FATT? writing on it?

[Matt Harwood]

Sounds about right. the two blacks are definitely earths.
I can check tomorrow to be certain, but I'm 99% sure that you are correct.

[Paul@SWZ]

I also am 99% sure that this is correct. Is the purple wire longer than the two black earths ?