ok...i just wired back in my original radio..and found some different colours used in the donor vt and mine.
firstly..the plug in the back has no slot numbers on it..so its hard for us to compare a slot number to slot number.
I found on my series 1 vt executive...1999 year auto ..that it did not have same colour coding as the vt series 1 1999 i looked at ....at the wreckers and removed the radio plug from.
the first up difference was 1 added wire on the donor plug....it had the constant 12v + --yellow /red
(if you dont have a constant 12v + ...in the car in your loom you wont need it in the plug...)
(if you do need ..and its not fitted either run a seperate wire from power 12v + side of the fuse box or battery..)
orange /white battery +12v turned out to be orange /black
brown/white dimmer in +12v turned out to be brown /black
so if you look at the plug with the plug clip (that located in the middle of the plug favouring one end) you notice a simple key to plug..
1 front side of lock tab is speaker front left and rear left
1 front side of the lock tab is speaker front right and rear right.
and that on on the front 4 positions a tab and 4 positions
( this handy cause di#khead holden makers have thrown 2 plain same coloured wires into the mix ..""grey"' and 1 is speaker grey... and 1 is dimmer out grey.....and to find out which you try each one..and the one that makes sound come from the left front door speaker is the winner
along the bottom there is 10 slot points.. but we dont use them all...the 2 under the tab ..are N/A ...and so is one furthest to end side slot ..N/A
and the bottom row goes like this...
battery12v+ access 12v+ ground phone mute N/A N/A dimmer out dimmer in 12V+ constant 12v+ N/A
So for a start...you should not be touching speaker wires with other power wires..
and you should not have power wires touching each other
I say pull the fuse out for radio first...
model radio eurovox 92047975
so there is 18 pins...of which 3 a never used on a vt if the vt dont have power aerial ( up + down) or amp
and dont need to use constant 12v+ in some vt's either.
this should help others as well