blown fuses

[CMF_POSSUM]

hi all has anyone had trouble with the dash lights fuse blowing? its the third fuse on the left from the bottom and labled TAIL (RHD) LAMP the only thing i have changed is put a cd player in like ive done many times i have solder on all joints i used the cars - or (earth) which i dont usualy do . have i overlooked the smallest thing? if not i will bye a pack of 10amp fuses and sort it out tomorro just thought someone may have come across this before thanks

ALL FIXED turned out i used the dimer wire as earth checked with m-meter