I got my metra 70-7551 harness in the mail today and noticed power, memory, ground, etc were all there but no wires for the car speakers. I see RCA cables that seem to be the same color as the speaker cables coming from the HU harness. My question is how do I hook them together? Searched with no luck

 

Ive got the same harness.....the RCAs are for you to use your head units preamp outputs, this way you can keep using the Bose system (speakers and amps) with your aftermarket head unit...so just plug the RCAs into your head units front and rear preamp outputs and youre good to go. BTW let me know which wire you use for illumination...thx!!

 

Oh, sweet lol. Thanks! Isn't the orange wire for illumination?

 

I thought so...but I have a double din Pioneer dvd player in my dash...I used to orange for illumination but it didnt work, my stereo works but doesnt light up...

 

Weird, I tested my kenwood double din by hooking up just the power, ground and memory and everything lit up fine. This was using my already taken apart bmw though, maybe I'll have a diffrent problem with the max but I'll let you know.

 

Im gonna disconnect that orange wire altogether and see what happens...let me know how you fare though