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This was recently asked in another thread so i have added it to here to help everyone else 
, More times then not the origonal ISO plug fitted to the mk2 astra has been cut out and you have to fit a new one, this should aid any confusion when it comes to fitting a replacment ISO block.
Power wires:
Thin red wire - Permanent live.
Thin black wire - Ignition switched live.
Thick brown wire - Earth
Speaker wires:
Offside front speaker:
Solid green - positive
Brown with green stripe - negative
Nearside front speaker:
Solid blue - positive
Brown with blue stripe - negative
Offside rear speaker:
Solid white - positive
Brown with white stripe - negative
Nearside rear speaker:
Solid yellow - positive
Brown with yellow stripe - negative
There is also a thin green/grey wire and a thin red/white wire, these to i am not sure about but they will be redundent with a new system.
, More times then not the origonal ISO plug fitted to the mk2 astra has been cut out and you have to fit a new one, this should aid any confusion when it comes to fitting a replacment ISO block.Power wires:
Thin red wire - Permanent live.
Thin black wire - Ignition switched live.
Thick brown wire - Earth
Speaker wires:
Offside front speaker:
Solid green - positive
Brown with green stripe - negative
Nearside front speaker:
Solid blue - positive
Brown with blue stripe - negative
Offside rear speaker:
Solid white - positive
Brown with white stripe - negative
Nearside rear speaker:
Solid yellow - positive
Brown with yellow stripe - negative
There is also a thin green/grey wire and a thin red/white wire, these to i am not sure about but they will be redundent with a new system.
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