Wiring for stereo

[dan4bean]

Hi there I could with a little advice concerning the wiring of a stereo, I have what I believe to be a live wire, switched live wire and ground, when connected recently these worked and powered the stereo, however after removing and refitting the stereo is dead with these wires attached (exactly as before) unless the metal chassis of the stereo contacts with metallic parts of the dash(rail). Any advice would be welcome cheers Dan.

[Matt]

The head unit is grounded through the cage and is earthing through the cage. Put an earth cable on the cage and also check the earth on the plug itself.