I bought the Humminbird 9 M SILR Y Adapter Cable so I could have dual transducers since I do not have a Jack Plate. Just had a question regarding the number of pins on the adapter cable. Each transducer has 7 pins. My unit also has seven holes to accept those pins. My question is why does the adapter cable only have six? Shouldn't there be an extra pin on the adapter cable or is it strictly by Design?
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