hi taken old orignal radio out and replaced with a modern one. trouble is electric ariel aint going up no more. used orignal wiring from old loom which was 3 wires. ignition, live and negative. didnt need speaker wires because running them through amp. ive plugged the ariel lead in but can anyone help me out with the wiring. what colours or colour wire from loom connects to my radio one which is blue. ive got the ariel up at the moment ive powered it from the amp. hope someone can help this is baffling me. many thanks gary