[BoneHead]

My son insalled a stereo in car, now the tail lights do not come on with I turn on the headlights, can someone please explain how I can fix this? Many thanks for any help!

 

[77Impala]

Have your son check the radio ground wire, on a truck I had, I had the same problem turned out that the wire I thought was ground was the parking lamp wire, which caused me to blow the original and second fuses I tried when I turned on the parking lamps.