+14V
Atom and Monsoon ECUs have one red wire that supplies power to the ECU.
Other ECUs have multiple power supplies. The power wire in connector A is used to power the ECU's internal supplies. High side current for Aux 5, Aux 6, Aux 7 and Aux 8 is also drawn from this pin.
Although the ECU does not draw a large amount of current, the voltage applied to the ‘+14V In’ wire must remain above 7 Volts at all times. This is especially important while the starter motor is being cranked. A significant drop in voltage will result in the ECU undergoing a reset that will stop the engine from running. As a result, it is important that the battery is in good condition and suitable for the application. Also, make sure that all wiring to the battery and associated terminals are clean and free from corrosion.
+14V Aux 9/10
The +14V Aux 9/10 power wire in connector B is used to power the Aux 9 and Aux 10 drivers. All high side current for Aux 9 and 10 is drawn from this pin. For non electronic throttle control applications both red wires should be connected to a relay that provides power when the key is in the ‘ON’ position.
The +14V Aux 9/10 wire provides an external power supply to the Aux 9 and Aux 10 driver circuitry. This allows external disconnection of the supply to these drivers as a safety measure when electronic throttle control is used. If electronic throttle control is not being used connect this wire to the same power supply as the ECUs +14V In wire. If wiring with electronic throttle control, refer to the Electronic Throttle Control section of this manual.
This wire MUST be powered in order for the ECUs self diagnostics and the Aux 9 and 10 drivers to function properly.
If no EThrottle 1 is being used and no significant Aux 9/10 high side current is being drawn then this wire can be connected to +14V.