Can I unplug the positive post to test my alternator on my 2011 soronto v6
Simple answer is NO ! That is a out dated idea . If you are in the US most Auto Zone stores can test your alternator and battery for free . Of course your replies will be better if you explain why you are asking the question.
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My understanding is that that can cause voltage spikes that can damage today’s electronic equipment. As already mentioned, a proper charging system test is recommended instead.