[keckers19]

I installed my Garmin 546 with transom mount transducer a while back, but only recently mounted the transducer. I had it plugged in, but just sitting there. I would get readings this was, but I wanted to mount it in the hull like I have seen many do. I simply attached it to the inside of the hull using 4200. Now it will not give any readings... Anybody know what's going on and how to fix it?

 

[Brett]

Air bubbles or core material blocking the signal through the hull.
Hang it back on the transom or find an inside spot where it'll return a signal.

How to...http://www.tomneale.com/tips13.html

 

[keckers19]

It worked before. I did move it further back though. Maybe the hull is thicker there.

 

[DuckNut]

Is the transducer glued flat to the hull?

Also, it needs to be 100% sealed to the hull- as Brett pointed out, air will make it not work properly.