In dash: Ground is black, 12V is red and only when turn the key, 12V continious is yellow (see also CiscoKid).
Rest of car: 'Black' = - and 'Red' = +
BMW '96 M3 (SOLD) June 2005 Car Of The Month!
Originally Posted by Torque
I was just dropped off here by aliens one day. They got bored with me.