I have a private pond and want to reduce the number of crappie. I took a model 57 hold 'm electric fence controller and via inverter connected it to a 12v deep cycle battery. I tested it at home in a 1 gallon mason jar of water with two "hot" leads in water and the ground to a cabinet hinge and it worked great(both lights saying good power and ground. Took it the lake today with a 10 foot devider and silver solder 4 pronged things off each end connected to the two hot wires and tried about twenty ways of grounding it. The power light comes on but the light that signals signal strenth wont light up. What am I missing?