Installed a Humminbird 386ci in my Trident 13

I installed a Humminbird 386ci under the sonar shield of my Trident 13 today. It was a lot easier than I thought it would be and felt good to do it myself. I copied the instructions from a British site http://www.anglersafloat.co.uk/humminbird-fitting.html which enabled me to get away with one large hole rather than two (transducer cable is fed twice through the 1" hole under the fish finder base).  To do this requires installing the control head base upside down compared to the diagram shown in the instruction manual, so the cable cut-outs are facing down.  The only slightly dissatisfying thing is that the after the control head is pivoted all the way forward, the sonar shield still just touches the back of the finder and therefore does not close completely.  I wonder if that is because of the inverted base orientation, or have other people experienced the same thing?  Functionally I think it is fine and will serve it's purpose of preventing waves and such from washing over the finder while transversing the surf zone.
I still have to do some work on the wiring harness, to install a fuse and, possibly, put the battery in a box.  Is there a battery case that fits a standard humminbird battery while still allowing use of the battery bag, or is a case even needed if the battery is hanging in the bag?  Does anyone have a picture of how they wired in a fuse?
The only other question I have is how to finish off the hole through which the cables pass.  I lined it with a rubber grommet and marine sealant and have thought about filling up the remaining space with sealant, but I noticed that the cables move through the hole as the control head is pivoted.  Will sealant interfere with the cables?  Is it even needed (the spot is pretty protected)?

looks to me like the base is mounted too high and could go lower and then the lid would close...but it looks ok the way it is in the closed photo too. I would add a piece of tape over the inside area of the wires thru the hull and then fill the front side with silicon-the tape is just a backer to keep it in place til it is dry.

I too need to add a fuse on mine soon-or do I need to??? Im running a battery only, no way to get a surge is there?  One more test run to be sure of the mounting and then time to finish it up.

It might be mounted too high, but the face of the control head actually touches the bottom of the sonar shield well when pivoted all the way forward....


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I have the exact same set up, and that fish finder is awesome. Love it.