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There are a couple of basics to check - perhaps you have already done these. First thing would be to check the grounding of the DME. See if there is any voltage between it and the negative terminal on the battery? Other than that, trace the 12V line back to the fuse, checking voltage at every connection you can find.
One quick-n-dirty check would be to run dedicated 12V from the battery to the DME to see what you see.
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Tom Coradeschi
03 Boxster
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