i have 3 cd players that if you tested them to a 12v battery they would work fine. But if you wired them to my car thru a aftermarket civic harness they do come on at all. I test the aftermarket harness with a test light only the red wire get power the ground and yellow connector of the harness does not. but when i coonect my stock civic radio directly to my stock harness it works fine. btw the i have two aftermarket harness that have the same problem. Any help?