1988 Mercedes Benz 560sl

Electrical problem
1988 Mercedes Benz 560sl V8 Two Wheel Drive Automatic 114000 miles

the problem I have is that when I turn the key there is no power to anything. I had just driven 200 miles and stopped for gas. The battery was checked and is fine. All the fuses in the fuse box are ok. I disconnected the battery and then reconnected it and there was power for lights, radio etc until I turn the key all the way to the right to start. That's when all power goes away again.
May 2, 2010.

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