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    1. #1
      Join Date
      Oct 2009
      Location
      Long Island NY
      Posts
      72

      When to use a relay??

      Doing a whole wiring harness on my 72 Z28 and was wondering if I need to use relays, Not sure what they do?? I do have elec fuel pump, elec fans, elec H20 pump. Whats the main purpose of a relay??






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