just bought a 1996 cherokee country when i bought it it had a aftermarket radio in it and it all worked fine then the other day the front left door speaker stoped working so i read up that wires break in the door jam so i took the wires out ran new ones all great then the radio stopped working in all speakers completly i poped all the speakers with a AA battery all good then i tested the power ground and accesory wire also all good the display turnes on but no sound not even static so i go out and buy another radio it worked for about 5 seconds then the same thing happend so i return it get another one and still no luck display turnes on but no sound any help is much apreciated