General no power to new stereo

[chrismerriman63]

Have just bought a new stereo. When connected to the bravo iso connector it wont power on. Do I need to take a live feed from elsewhere?. Also, might sound stupid but do I need to earth it ?

 

[tomharrison]

I'm also interested in this, having same problem, I've heard you can get it from the cigarette lighter which is 12v and it will turn off automatically instead of Manually

 

[chrismerriman63]

i have just checked and the head unit is definately getting 12v on the red wire, and earth is fine
the yellow 12v battery wire is not getting anything
i would normally put this down to a faulty head unit, but earlier a got one from halfords, plugged it in , and again , nothing
hope someone can shed some light on this

 

[carlorff]

Earth yes,that is why it was meant...Did the unit you took out to replace work or not on the same connector?

 

[chrismerriman63]

standard fiat one plugs back in and works fine

 

[carlorff]

does it have a 7inch LCD?

 

[Most Easterly Pandas]

OEM head unit doesn't have a switched power feed, its CANbus operated.

If you use a patch lead for steering controls it should also sort the switching issue

 

[chrismerriman63]

hi easterly.
i know absolutely nothing about how the canbus operates,
but i assumed that as the live is constant, and is showing 12v up to the new headunit (on my multimeter) that the new unit should operate
i didnt think a new off-the-shelf hu would care about anything but recieving the power supply...or am i missng something?
thanks, chris

 

[Most Easterly Pandas]

Most after market head units have 2 power feeds. A contact to maintain internal memory such as radio presets etc, and power the device when switched on, and a signal feed which is an ignition switched feed to turn the unit on and off with the ingition when you drive and stop the car.

 

[chrismerriman63]

does this mean hat the yellow (12v battery) should be permanent live and the red switched?
i have no problem splicing the wires, just like to know before i start

 

[Most Easterly Pandas]

does this mean hat the yellow (12v battery) should be permanent live and the red switched?
i have no problem splicing the wires, just like to know before i start

No, you're best wiring it as intended, if you make them both permanent live, depending upon the head unit, you'll start getting a flat battery when the car is sitting.

 

[chrismerriman63]

thanks for your help most easerly
have just tried unit with a live feed to both red and yellow and the unit operates
one more question if i may, will the battery still drain if i turn off the unit when leaving the car? my understanding (whith may be wrong!) is that it is only using power to retain presets etc

 

[Most Easterly Pandas]

one more question if i may, will the battery still drain if i turn off the unit when leaving the car? my understanding (whith may be wrong!) is that it is only using power to retain presets etc

It depends upon the head unit, they shouldn't, but a fair few do, hence saying you might end up getting a flat battery. Could always risk it and try.

 

[tomharrison]

hi chris, could you tell me what you did with the red an yellow wires to make it turn on? thanks

 

[chrismerriman63]

i connected both the red and yellow on the stereo loom to the red (constant live) on the fiat loom
the stereo works pefect, you just have to manually switch it off when leaving the car

 

[BRIANMULLEN8]

i connected both the red and yellow on the stereo loom to the red (constant live) on the fiat loom
the stereo works pefect, you just have to manually switch it off when leaving the car

I went right down to the 12v cigarette connector. It switches off/on with the engine.

 

[chrismerriman63]

how did you get at it? i looked at that,but it looked like a lot of stripping to get behind there

 

[robertzd]

Hello. I bought new HU from E-bay.
http://www.ebay.co.uk/itm/Autoradio...5?pt=LH_DefaultDomain_101&hash=item5b0f583733
Connected plug and play and it dont work like original radio. I mean power on -off
The original radio switch on/off with ignition. And you can swith it on manualy without ignition and after 20 minutes he auto switch off.
And the new radio switch on/off with ignition but i canot turn it manualy. :bang:
Any advice, what is the problem?

 

[tinymartin]

Thanks all. Connected via cigarette lighter. Works fine.

 

[Most Easterly Pandas]

Hello. I bought new HU from E-bay.
http://www.ebay.co.uk/itm/Autoradio...5?pt=LH_DefaultDomain_101&hash=item5b0f583733
Connected plug and play and it dont work like original radio. I mean power on -off
The original radio switch on/off with ignition. And you can swith it on manualy without ignition and after 20 minutes he auto switch off.
And the new radio switch on/off with ignition but i canot turn it manualy. :bang:
Any advice, what is the problem?

The problem is your head unit doesn't support it. Most after market (or even OEM) don't.