MoTeC AFM1 - Manual (Page 8)

4 Meter Operation
The Sensor has an internal heater to heat the sensor quickly and ensure
adequate temperature when exhaust gases are relatively cold (i.e. when the
engine is under light load).
When the internal heater is used the sensor will normally give good readings
within 2 minutes of applying power.
Power Supply
The Power supply must provide current for both the Meter and the Sensor
Heater Element. The vehicle battery is usually the most convenient source of
power.
Connections
The lead supplied with the Meter should be connected between the Meter and
the Sensor.
Power should be applied to the cable by connecting the Red Wire to Battery
Positive and the Black wire to Battery Negative. This connection powers both
the Meter and the Sensor Heater Element.
The Sensor has two connectors one is for the Sensor Element and the other
for the Heater Element. If the exhaust temperature will exceed 800 deg C the
Heater Element should NOT be connected.
Note If the Heater Element is not connected the sensor warm up time will be
increased and the Sensor may not read correctly if the exhaust gasses
are too cold - see specifications.
Red Battery Positive
Black Battery Negative
MoTeC
Air Fuel Ratio Meter
Refer to Appendix B if full wiring details are required.