QUOTE (Sapro @ Feb 1 2015, 09:00 AM)
Will take the multimeter out there today, good idea.
What Conrad said Phil. Any little bit of corrosion can cause just a few ohms of resistance. At the current ratings of a trolling motor, with an impedance of just a few ohms itself, a couple ohms of resistance along the path between the battery and the motor is effectively a current limiting resister and acts as a voltage divider.
I suggest you solder any connections between the battery and the motor. Crimp fittings are conducive to corrosion.