well the ground should be tied to the chassis ground.

The Ignition wire should be fused most likely, and is either a blown fuse int he fuse box, or it is disconnected somewhere.

The other wire, would probably be the power antenna trigger wire.

Alon

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