Originally Posted by 4x4kiwi

I wonder if Martin (Martysmartie) or Ian (Iansoutham) or anyone else for that matter, can confirm when the red/white wire (30-29 on the schematic) is supposed to be live. Martin mentioned that it is an ignition switched live, but I am wondering why it is supplied via the radio and not just switched via the ignition. My thoughts are that it is possibly only live when the radio (as opposed to CD etc) is on perhaps like the electric aerial drive feed they used to put out on stereos. My car (1990 4x4) had had a different head unit fitted before I purchased it 18 years ago, and over the weekend I was fitting a different unit and noticed the red/white wire is not connected at all. Although I haven't checked at the amplifier yet, I am assuming this is therefor unpowered, which would account for my weak signal mentioned in a post further up. Interestingly the radio works perfectly well when there is a strong signal around, only breaking up a bit when I get close to home which is in a bit of a valley. I mention this because I wonder how many others have fitted a new head unit and only connected up the battery and ignition feeds and a ground, possibly the lighting feed (grey/yellow) if needed and not realised what the other wires were for. (aerial amp feed and alarm) I will attach the diagram again in case that helps. I had attached this and a couple of others related in another post by qed296 asking about his stereo wiring which can be found here. https://passionford.com/forum/techni...tion-help.html . Thanks David