FITMENT: Part Number: 1852086. The MKR-MDI-2 Adapter Cable is compatible with Humminbird HELIX 7 G3, G3N, G4 and G4N models FEATURES: 1) The 1852086 Transducer Adapter Cable connects your Humminbird HELIX 7 G3 or G4 fish finder with a built-in MEGA Down lmaging transducer on your trolling motor, you'll be able to scan deeper and wider without sacrificing clarity .
eBay