94 s10 blazer no current to fan motor

My Dad called me this AM with a problem with his Blazer. The blower for the heat does not work on any of the speeds. He checked and there is no current to the motor. So, is it the relay, the switch or the ingnition switch? I am going to go and see him in a couple of days and wanted to know the most likely place to start looking to save money and time!
Thank you! AJ

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