I have a sony xr-2390 car radio and having no luck as to determining what wires are what to hook this baby up....thanks...DANE

most aftermarket stereos have the following wire colors.

Let me know if your sony has the same colors...

Yellow - +12V Constant power
Black - Ground
Red - +12V Accessory power
Orange - Illumination (Sometimes orange/white)
Blue or blue/white antenna trigger / remote turn on lead for amplifiers (now depending on the radio, if it has both, some radios will turn off the antenna when on cd mode)
Yellow with black stripe - Typically cellular mute - when this wire is grounded radio will say mute ( not available on all radios)

Speaker connections:

White + Left Front
White/Black - Left Front
Grey + Right front
Grey/Black - Right front
Green + Left Rear
Green/Black - Left Rear
Purple + Right Rear
Purple/Black - Right rear

Those are your typical aftermarket stereo wire colors. it is pretty much a standard now a days, but some older units had different colors. but I am pretty sure most any radio made in the last 5 years at least should have those color combinations.

If you need the wire colors for your car to hook things up, post your model and year and I will see what I can find out...

__________________
'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon

I am installing a JVC deck into my 97' E420. I have everything but the speaker wires working correctly. I am wiring them directly into the deck. I was going off of this schematic for the wiring.

http://www.beckerautosound.com/1492.html

But I can't get any sound at all. Any ideas? I read somewhere that the audio wires were part of an optical loop, is this correct, and if so can I still wire the speakers directly to the deck like any other car would be done?

thanks.