Cortina MK5 Crusader P21 radio in Electrical Posted July 19 Trying to get my radio working ( the wires were taped up in the dash ) The yellow (live with fuse holder) is ok as is the aerial and speaker wires. There is another (blue) wire im assuming it was for electric aerial originally but now has manual aerial. This blue wire is live and when disconnected , the radio goes off. When it is left connected and the radio is turned off i can hear crackle from the speaker. Could anyone advise please ?