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JohnA

My depthfinder has a mind of its own. It works fine, then will just show 3 dashes. After a while it will resume doing its job of showing the depth. It does not matter deep water or shallow, sailing or motoring slow or fast, calm or rough sea state. My boat is a 1975 vintage Ericson sailboat and I installed the transducer on the starboard side just ahead of the keel. The boat lives in the water year round and so I needed a shoot through transducer. The only transducer the local dealer had was a Raymarine E6608 - a P79 with a plug on the end of the cable. I got a wiring schematic on the internet, cut the plug off and crimped small spade terminals, #3 bare - shield, Blue plus depth#2, Black neg depth #1. The transducer was installed following the instructions closely. I have double checked the connections to the back of the i40 that they are secure and not loose, checked the propylene glycol in the housing etc. The i40 gets power from a fuse panel and the fuse panel is fed directly from the battery and powers the depthfinder, VHF radio and chartplotter. I have tried only using the depthfinder to see if there is a power issue but the problem remains. Is there any way to determine where the problem lies - transducer or i40?
Thanks, John.