I have installed a new Nexus NX system into my boat to replace an old Nexus/Silva system. I never used the old system which used the same holes and layout, so I don't know how well it worked when it was working, but I can't get the log paddle wheel
to spin when fully inserted into the thru hull
housing. The weird thing is that if I pull it slightly from the housing, it will spin - albeit not very well. When spun by hand (in air) it spins and reads perfectly.
The only thing I can think that is causing it not to spin is disrupted water
flow (yes I've double and triple checked the paddle wheel
is facing the right way when mounted!). The depth
transducer is mounted about 8" or so in front of the log, so I'm guessing this would be the culprit.
Does this sound likely, or does anyone have any other theories on why the paddle wheel doesn't want to spin?