Hello,
I have a Minn Kota 330D 3-bank battery charger that has a rusted out NTC thermistor. An NTC thermistor is a temp sensor that's soldered between the green and white wires and it's located inside the little rubber box on the cord where the white and black wires exit the black cord. Unfortunately, the extension cable MK sells will not work.
If you have an old / broken MK battery charger, I'd be willing to buy the cable(s) from you so I can repair mine. Send me a PM or email and we'll discuss.
Thanks for your time! Jayson