Help with my 20yr old punto

[Przemyslaw]

I have problem with my after market stereo on my 20 year old punto...

When connecting all wiring it starts the stereo only for few seconds and then it goes black. I know the stereo works as I've tried on different car.
I have read few articles and got to conclusion that my car isn't producing enough electric power for the stereo to stay live.
If this is true, please can anyone tell me of there is solution to get more power?? I've got new battery and thinking to get new alternator.

 

[the green vanper]

Hello Przemysław,

What kind of stereo is that it needs extra power? A simple 1DIN? or something paired with an amplifier?

 

[MazCinq]

You need a multimeter to check you are getting 12v to plug in the back of the stereo, if aren't my guess would be that a wrong fuse has been fitted and it's not allowing enough current through

 

[Przemyslaw]

Hi. Please see below.
Regarding the fuse.. in car or in stereo?

 

[the green vanper]

OK, so a typical aftermarket android unit, no amplifier.

The standard power should be enough.

Check all the connections, especially the power ones. Are they properly connected? There's a wiring diagram on the sticker. You could need a FIAT - ISO adapter, but it should be possible to connect the radio without one, eventually changing the positions of the pins in the plug. You should have a wiring diagram on the factory stereo, which allows a comparison on both sockets. If you haven't got one, there should be one somewhere on the internet.

You need a multimeter to check you are getting 12v to plug in the back of the stereo, if aren't my guess would be that a wrong fuse has been fitted and it's not allowing enough current through

The fuse on the back of the radio unit is a standard 10A fuse for a radio unit. Car installation nominal voltage is 12 V, the alternator gives 14,4 V, so the radio and the installation should be able to receive 144 W. Such a radio unit won't need that much power, it has max 40 W from my experiance, even though the chinese would say 4x40 or even 4x50 W

A fuse beeing the weakest point of the wiring is ment to prevent the wiring. So, if the receiver (radio) will try to get more power than the 10 A, the fuse should blow in order not to burn the cables. A fuse cannot prevent some power from transferring. A blown fuse cuts the circuit, so no more power until it is replaced.

So a totally wrong guess.

 

[Przemyslaw]

So I have checked the voltage to the radio and it's as its should be.
The internal fuse box had a 7.5 fuse so I've upped it to 10 and the radio got a 10 also. And no luck....
Now because the radio starts but goes off.. I'm thinking that there might be a groud issue? Correct me if I'm wrong.
I'll check for loose/corroded/damaged wiring but if all good I'm out of ideas...

 

[PuntoHowTo]

So I have checked the voltage to the radio and it's as its should be.
The internal fuse box had a 7.5 fuse so I've upped it to 10 and the radio got a 10 also. And no luck....
Now because the radio starts but goes off.. I'm thinking that there might be a groud issue? Correct me if I'm wrong.
I'll check for loose/corroded/damaged wiring but if all good I'm out of ideas...

Ok so the fuse protects the radio it does not restrict the power so please change the fuse back.

From the picture I see it is a mk2 Punto.

These do not use the standard wiring found in radio ISO connectors. Two of the wires in the cars wiring loom are for the canbus System to talk to the standard radio but they have no function in an aftermarket radio and need to be disconnected, then you will likely have to make another switched live connection to the radio to tell the aftermarket radio when to switch on and off.

 

[the green vanper]

Ok so the fuse protects the radio it does not restrict the power so please change the fuse back.

From the picture I see it is a mk2 Punto.

These do not use the standard wiring found in radio ISO connectors. Two of the wires in the cars wiring loom are for the canbus System to talk to the standard radio but they have no function in an aftermarket radio and need to be disconnected, then you will likely have to make another switched live connection to the radio to tell the aftermarket radio when to switch on and off.

There are appropriate FIAT-ISO adapters available on the market. It's easier for someone who does not know how it works.

 

[MazCinq]

Thinking back, I had a similar issue in my old Corsa, that turned out to be a faulty head unit, is it a new head unit or has it suddenly started happening??? Have you tried a different radio to see if that works???