AEM 30-2500 AQ-1 Data Logging System - Manual (Page 5)

Page 5 10-2500 AQ1 Instructions RevD 102512.doc
Figure 3 below shows the connection for an engine speed signal using an AEM Twin
Fire CDI.
Digital 1-3 are switched to ground digital inputs, 16.5 V MAX tolerance.
Examples: Clutch/brake/cooling fan ground switch, nitrous solenoid ground or ground
switch input to start/stop Logger (Ground activated input). Figure 4 below shows wiring
diagrams for an on/off activation switch and a nitrous solenoid. The corresponding
wires in the harness for Digital 1-3 are Brown and are labeled SW 1, SW 2, and SW 3.
SENSOR POWER
The AQ1 Data Logger has an internal low current 5 volt power supply that is used for
powering sensors that require a 5 volt excitation. The corresponding wires in the
harness are Red and are labeled 5 VOLTS.
Figure 3. Engine RPM Signal From CDI
Figure 4. Activation Switch (Left) and Nitrous Solenoid (Right) Connections