alpine cda 7837 to kenwood kdc mp238

here's what you can try.

get yourself a AA battery and unplug the kenwood speaker wires (green, white, gray, purple...all pairs) from the vehicle harness, leaving some slack on the vehicle harness and leaving it plugged in to the car.  DO NOT REMOVE THE POWER LEADS(RED AND YELLOW)  and just leave them hanging, they will be live and can ground out. 

hook your positive terminal from the AA batt. to the solid wire and the negative terminal to the same color wire with the black stripe.  you will get a popping sound from whatever speaker your testing.  If you get nothing then your speaker leads are not going directly to the speaker, or there is no speaker.  try this for all four speakers and see what you get...if you get a pop on all four speakers then your speakers are good and something is wrong with your deck....

Now...just curious....the blue/white wire is also hooked up to the blue/white on the vehicle harness right?  if not hook it up first before you try what i explained. 

Also...this may sound kind of stupid....but also make sure your Front and Rear fade are balanced properly!  you'd be surprised!

I finally got them to work the problem was that there was 2 pairs of RCA cables and one of them were carrying the sound of the front speakers. The RCA cable was hidding near the vents. Thanks for all your help joch1314 before finding the second pair of RCA cables I did the thing you mentioned using the AA batteries and it worked which made me check if there was a RCA cable I could of missed.

THANK YOU!