Hey! Im tring to do the same thing to my 83 SD, ive got the JVC 180watt headunit and im stumpped on how to install it.

Ive figured out the atenna wire and the 2 speaker wires also.

But i dont know which wire do i hook up with those 5 you were talking about.

What are those 4 wires that are connected in that 4 pin stock connector ???

What are you sopposed to do with those 2 ground wires??

Are the 2 black wires with a line of green in the the rear speakers>? Im not srue cuz they are bigger gauge wire then the front.???


I really need help installing my headunit. Can you explain to me what im sopposed to do?