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Do you still see the distortion under AC power? If not, I would suspect your dimmer settings or the "cap fix" that is associated with it. Otherwise, I would suspect wiring on the ignition sense line or it still could be a blown fuse (but I am not sure if there is a fuse that would only show symptoms under these conditions...).
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Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs