Negative connector piece has broken off. I've been wrapping the wire over the battery terminal when using my sonar. Strip back the wire and connect with an alligator clip? Anyone else have
Piercing Free Stripping and Broken Wire Connector 2 in 2 out 0.5-1 Square DIY Fast Terminal Block Lamp Connect Connector - China Terminal Connector, Free Stripping Wire Connector | Made-in-China.com