500 Radio wires

[Mikefraser93]

Hello can anyone help please. Trying to change the radio in my wife's fiat 500 but the new radio just won't turn on. But some one previously has a ran a red wire which I think is the new permanent live then they have cut a red wire with a white stripe. Just wondered if any one knows what your meant to do

 

[John202020]

Got a meter? Or a small bulb, check what's on the wires, pretty sure the original wiring is permanent live, it's the can bus that turns on the radio, you need a switched feed ( from the lighter/power socket) for auto on, for now to check on a standard aftermarket radio connect the yellow and red together should turn on but don't leave it this way
Restore any previous alterations to factory

 

[decappottabile]

What year is your car? Facelift models use the Canbus to switch on the radio and thus a permanent live is required for an aftermarket radio.
For older cars you should be able to use one of those simple adapter cables. No need to cut wires.

 

[Mikefraser93]

It's a 2009 model

 

[John202020]

Ok your new radio is it a branded unit say Alpine or Kenwood?

Temporarily bridge the yellow and red does it turn on?
Is the aerial connected ?
Are you sure the earth is OK?
Have you restored any previous modifications?
Are the original radio plugs still on the ends of the factory wiring?