R31 Stereo Installation. Help!

[GXE23]

HELP!

I've spent the past week trying to nut this shit out, but I'm getting no where. To skip over a lot of details and cut RIGHT to the chase.

I am trying to complete my stereo install on my 1989 R31 GXE.

I have re-run speaker wiring to doors/parcel shelf etc. I cannot for the LIFE of me (Without fear frying my head-unit) figure out which is 12V constant. And Which is 12v Accessories/Ignition.

After looking on multiple pages/sites/forums, I now know that BLUE/BLACK are the Accessories/Ignition & WHITE/GREEN is 12V Constant.

However, I have 2 white/green and 2 black/blue wires:

Also I was told investing in a Voltage Tester would help. I have uploaded a picture of the one I have which works on 240V accessories but will not register ANY current on any of the wires on my car. Is this perhaps due to the type of Tester I have, as it doesn't have a "ground lead"? So ultimately, buying the tester has gotten me no further along with something that should be so simple.

If anyone at ALL can help me with nutting out these last 2 wires, it'd mean the world.

[MOBASS]

Buy one of these 12Volt testers and you will be able to work out which wire is permanant 12V and accessories in 2 seconds

http://www.jaycar.com.au/productView.asp?ID=TD2049

Simon

[niZmO_Man]

^ As above

Could have invested in a multimeter instead of that tester you got (assuming it cost >$20). I think the orange one might be a 12V source lol. It's been years since I done the install in my R31.

[Chris Rogers]

org - 12v (for ADM - HR31 is different)

blu/blk - 12v key.

chassis ground

cannot remember lights in the ADM.

[r31slpr]

If you haven't figured this out by wednesday i should be able to help you out.

[r31slpr]

Forgot about this, do you still have the plug for the original head unit? The white/green in the top right corner is the constant i used and the blue/black below it is the ignition 12v.

Here is the plug i was talking about in your other thread.