electrical gremlens..help!

[yote1234]

ok...just noticed that after i installed my am/fm radio that my exterior lights and dash panel lights up when i apply the brakes..and when i turn the left blinker on both front and rear lights flash.. as if my flashers were on. at night when i turn on the lights the tail lights are bright...like brake lights are on all the time..now it could of been like this before i installed the radio. im not sure? i checked all brake light bulbs and front parking bulbs..all ok. i unpluged the radio..no change.i did just get it back from a transmission rebuild... anyone ever run into this problem? h e l p !