W the battery and radio on your bench and some jumper wires, positive to 12V input and make sure you not on the dash light but the actual power in, ground chassis to neg. 2 wires to speaker. I think there is a little "trimmer" knob somewhere on the case to fine tune the reception but it sounds like your dead in the water. Not sure if there is an internal fuse or not. Not much info but that'd be where I'd start and almost forgot if you get any noise you'd want to plug in the antennae and jumper it to the case also