i am fitting 2 through hull transducers as i have a deep keel ,i have tested them with a as side y-splitter cable 720055-1 the cable is labeled side and dual beam and it only seems to work with the plug labled side, plug in, is this the correct cable? or do i need to switch some thing on in the unit?
i notice the cable you mention is as-si-db-y cable.
Any help please