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Live wire feed for headunit
Posted: Sat Jul 24, 2021 3:08 pm
by matt_3051
Hello guys, i bought a new head unit today and i connected everything up but no power. Took it to halfords and they said i need to connect a live power feed but they wanted 170 for the job. I wanna do this myself so what do i need to do this.
Re: Live wire feed for headunit
Posted: Sat Jul 24, 2021 3:10 pm
by matt_3051
the red and yellow are the live feed wires but i dont get it
Re: Live wire feed for headunit
Posted: Sat Jul 24, 2021 4:50 pm
by iichel
perhaps you need to connect the red wire to an iginition live wire. but it's a bit of a guess.
Re: Live wire feed for headunit
Posted: Sat Jul 24, 2021 7:31 pm
by matt_3051
iichel wrote: Sat Jul 24, 2021 4:50 pm
perhaps you need to connect the red wire to an iginition live wire. but it's a bit of a guess.
I've been told this but i don't get what im meant to do exactly. Do i need anything else or do i simply just connect it to something?
Re: Live wire feed for headunit
Posted: Sun Jul 25, 2021 9:33 am
by iichel
i'd check all the wires of the radio according to the manual and see what comes up. i'm seeing a lot of loose, unlabeled wires so unsure what to do.
Re: Live wire feed for headunit
Posted: Mon Aug 02, 2021 2:05 pm
by alexpc
I did this a few years ago but I cant remember 100% exactly what wire is which.
The 9N3 doesn't have a switched power cable to the radio that provides constant power when the ignition/accessory is on as far as I know. You'll possibly need a canbus emulator (£10 or so) if you don't already have one. Orange/black is CAN+, orange/brown is CAN-, brown is GND, the yellow/red adjacent to the brown wire is the safe wire constant 12v (for factory radio code) and the other yellow/red is supposedly also constant 12v. The black/red may be switched 12v, but I don't think it is that simple hence the need for a canbus emulator. Best to just get a multimeter and see what wire does what when you turn the ignition on/off. If you also need an illumination wire (since that definitely uses canbus) then you can tap into the 12v accessory illumination behind the gearstick.
Re: Live wire feed for headunit
Posted: Tue Aug 10, 2021 5:56 pm
by matt_3051
alexpc wrote: Mon Aug 02, 2021 2:05 pm
I did this a few years ago but I cant remember 100% exactly what wire is which.
The 9N3 doesn't have a switched power cable to the radio that provides constant power when the ignition/accessory is on as far as I know. You'll possibly need a canbus emulator (£10 or so) if you don't already have one. Orange/black is CAN+, orange/brown is CAN-, brown is GND, the yellow/red adjacent to the brown wire is the safe wire constant 12v (for factory radio code) and the other yellow/red is supposedly also constant 12v. The black/red
may be switched 12v, but I don't think it is that simple hence the need for a canbus emulator. Best to just get a multimeter and see what wire does what when you turn the ignition on/off. If you also need an illumination wire (since that definitely uses canbus) then you can tap into the 12v accessory illumination behind the gearstick.
i got it sorted today, the illumination cable i didn't need so i tied that up and found a "hole" on the actual power adapter that had a point where it had no power when the ignition switched off. Used a multimeter for this and it works a treat. The actual stereo headunit is perfect for anyone new who would like a good one that's decently priced (£99.97). Only issue with this unit now is dont buy the cages from halfords because they're absolute trash and don't fit the unit properly. Thanks for the help, really helped me out.
Re: Live wire feed for headunit
Posted: Fri Sep 09, 2022 2:10 pm
by fxceltic
hey Matt, think I have same issue as you and same wiring loom (from dynamic sounds)
which fuse number did you tap into in the fuse box? Did you only connect the red wire in there?
Ive connected my headunit all up with the looms/ connectors etc and thats all fine, but cant locate where to connect the red wire to in the fuse box so it turns on and off with ignition