My dual spals have a ground wire attached to each motor.  I grounded them to the radiator support.  I also have two relays and two in line fuses and two sensor wires.  I ran each of them parallel.  One power source, one ground source and one sensor.  I ran the power wires to the ignition blade in the fuse block and both sensor wires to the sensor in the intake.  Your fans should not be continually running.  They should pull enough air to cool the temp enough to shut off and then start again when the temp climbs.

i have all the wiring correct. i wired it so the fans would run after you shut car off. as gunslinger stated that the fans coming on at the same temp the thermostat is set may be why the fans run continuously when the engine is running. it keeps the temp perfect but when it starts to drop below 195 the stat closes and reheats it right back up. my problem is after i shut car off the fans run continuously but i may have the stat causing the problem. i think when it closes at 195 the water doesn't circulate past the sensor right causing them to stay on. i installed a lower temp stat and will see what happens.