Wow, you have a metro and a benz. Not a typical driveway pair.

As for your problem, it sounds like you have blown a fuse in your metro. If you can't get any power readings with your MM at the harness a fuse is blown. Check the wire to see if there is a bus fuse there. If not, go to the car's interior fuse panel and check the fuse on the radio/accessory circuit.

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