Lowrance 3400 Connection Question

Dave - M

Active Member
Aug 29, 2018
225
Pennsylvania
Boat Info
1990 270 Sundancer
Engines
7.4 Mercruiser
I have a Lowrance 3400 that hasn't worked for a long time. I have a new 3500 that should use the same transducer, assuming the transducer is still functional. The 3500 has a gray connector on the back. The 3400 has no connector on the back of the unit: the heavy black wire comes out of the unit and disappears into the bowels of the dash.

Anyone know if there's a gray connector in the line anywhere on the 3400s?
 

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