I figured out the problem. One of the 50amp breakers was bad. There was 37 volts at the trolling motor plug in. When I turned on the trolling motor, it would drop to 7 volts. All three batteries tested a little over twelve volts individually. So I replaced the breaker one at a time. When I replaced the one one the rear passenger side battery, the trolling motor worked well. When I took it out this past weekend, that breaker tripped if I had to turn the motor up high. It reset fine but did trip several times. Any more suggestions?