Do you have a volt meter or a circuit tester? You should have a constant power and a switched power. Constant power will give a reading without the key in the ignition. The switched power will only come on when you turn the ignition key past the locked position. As stated - the power wires should be red (perhaps yellow). Ground should be brown. Blue is power antenna. Two-tone wires are for your speakers. You can test speaker wires without a volt meter by hooking up both ends to both ends of a 9-volt battery. When you do so, the speaker connected to the wires will make a *scratching* sound.

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Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired

"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon