i'm trying to hardwire the passport 8500 onto my 2005 wrx. i choose to tap in to the cig lighter but i don't know which wire to tap in. there 4 of them in different colors.
black, red, white + blue and green.
the direct wire kit has red and black. so i suppose to connect the black to some kind of ground (like some metal near by) and the red to cig lighter's red?