You might try bending the pins ever so slightly in the Xducer cable end...maybe it's not getting good contact on the right SI beam pin...
Even try taking the cables out of the collector and plugging straight into the unit..(it's easier to wiggle the connector ends to check for a loose connection if the cables are not in the collector )..
If you know someone with a SI unit... You can try your head unit on their boat or their head unit on your boat ...
Rickie


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