This device has been designed for 0-80 A current range. The polarity of the voltage is printed to the circuit board with "+" and "-" signs. If you want to measure e.g. the current of your receiver, connect the battery negative connection to the "-" connection of the device, battery positive connection to the positive connection of the receiver and finally the "+" connection of the device to the negative connection of the receiver.

Fix the unit firmly to the vehicle from the mounting holes using screws. Connect the sensor to any of the free auxillary channels (AUX 1-5) in the FDR. The AUX 1-3 channels are with 12-bit and 4,5 with 8-bit resolution.