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hmm interesting have you checked the terminals make sure its nice and tight. also check the bottom of the vehicle because like my 2011 550 the negative and positive run through the bottom of car on right passenger side and starter is right there as well bottom of crankshaft and above plastic cover. look for anything suspicious.
Another spot to look at is passenger side under the hood above wheel suspension, will be black plastic cover remove that a sensor or plastic plug might be holding it with t-20s, but their will be a small red terminal there
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