[coopzone]

Morning, I think it's quite likely that the cable is wired the wrong way (but really there is no wrong way). If you check the trader sheet / manufactures sheet - there is no indication as to polarity. Thats because these radios had no fixed polarity you can connect them either way. The fact that it has red/black cables is almost certainly because is was cheaper to buy it like that. they may as well be both pink.

Having said that, i like you, would always try and get what i consider to be the safer (? very slightly, but not really) option of neutral towards the chassis. It should still be considered live and deadly.

Derek