Hi there the switched live is normally red and permanent live is normally yellow, only had my alfa 5 days so not changed head unit yet, am switching over to my alpine on tuesday if you havent got it sorted by then I will post back and let you know for sure, providing my 156 is the same
Ok - now in the power connector i have the following:-
Red - 12V + (Always on) -Main Power Lead.
Red Green - 0 (not earthed, but no voltage either?)
Blue and White - 12V+ (I think this is for the Electric Aerial?)
Black - Earth
Yellow - 12V + (For Illumination, goes live when lights are turned on)
I think the Red Green wire is somehow faulty. I think this should turn live with the ignition but it doesn't? Can't be a fuse becuase surely i would have no power to the radio connector block???
Trouble is i haven't seen the car with the OE headunit to see if it turned off with the ignition?
Ah! Thought you were referring to Hidaminium cylinder head units. ICE noise I presume. Sorry about the lack of current knowledge, I originate from Tropical Swamp days, when 'E' types had cork seals in the rear hubs packed with grease! Was still a great roadster, in a straight line, but Oh! that 'orrible torsion bar front suspension, and timing chains that rattled at 40K. Cheers, Z.F.
David, you have really stirred 'me ole' brain a bit. Do Alfas have isolated earth return circuits? i.e. the earth return is off with the ignition? Those HND electronics guys out there are going to put me on the spit roast over this one!! C'mon guys and gals, sort me out.
Im glad you cleared that up nos .... thought id done something odd on installing my head unit ....... very unusual for a constant live on a car that age dont you think? I cant remember the last car i had like that ..... my old '76 vauxhall 'shuvvit' maybe
In my country it's obligatory to use lights even at day, so I have 12V in illumination wire whenever I turn on the key. Figuring that out, I just switched pins in ISO connector and put orange wire in place of red/green wire and presto... switched live wire. Hope this helps, but I don't know if GTV came with auto on lights device from factory.