Sorry, I know this seems like a dumb question, but is this a transducer or triducer? Looked at a H34 on Sunday with this in the shower bildge, it has a grey wire leading aft through the limber holes but its not like any transducer I've seen before. The three instruments on the boat didn't work and were old Signet stuff if I remember right. Trying to figure out if I would need a transducer or if these are able to be diagnosed to know if the screen or transducer itself that is bad.
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