I have two Humminbird fish finders. One bought at BPS recenty. One bought on Craiglist recently. Both are not working. I will try this and see if I can get some advise on the first one and then might bug you on the second.

Humminbird 170-Purchased at BPS, installed on my trolling motor in the last two weeks by a gentleman that has forgotten more about mechanics and electricity than most will ever know. In other words, a sharp dude with a tremendous aptitude. When unit is powered up, it immediately says "Transducer not connected" although you can clearly follow the lead from the end of the trolling motor to the back of the unit. It is secured snuggly into its proper slot in the back of the finder. When I hit the left arrow, it goes into start up mode and the temperature shows 99 degrees and the depth shows 0 ft. That's it... Any ideas?

Thanks for any advise!