Hello people, so im just about to put a new head unit to replace the ford effort in my '88 3i.. thing is ive not changed one for a few years and totally forgot what goes where. In the car i have 1 brown wire, 1 yellow wire, 1 red wire and 1 red and white wire. On my head unit i have 1 yellow, 1 red and 1 black. Can any tell me what goes where before i blow myself up. Ta much..