mysterysktr7

i have a major short problem... out of all the stuff I know about my EJ1 shorts are not one of them. When my radio is plugged in the parking lights and gauge lights do not come on because i blow a fuse EVERYTIME! When its not plugged in the guage lights come on and the parking lights come onand no blown fuse. However my gauge needles dont work anytime and the turn signals dont work either way anytime. im about fed up with this problem, can anyone at least tell me how i go about finding the short, or were the most common spot for this type of short to happen? any help is much appreciated.