Edelbrock Pro-Tuner, User Manual

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5.7 Coolant Fan Output
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Coolant Fan Output
NOTE 1: To use this feature, you MUST use an approved high current fan relay. DO NOT
attempt to drive the fan directly from the ECM output wire or ECM damage will occur!
NOTE 2: To use the fan control feature, you must add the Edelbrock fan relay wire to
your ECM. On 48 pin units, the wire must be inserted into pin A3 (pin 3 of the A
connector). On 80 pin systems, the fan relay wire must be inserted into pin B8 (pin 8 of
the center connector). See harness schematics. The pin numbers are indicated on the
face of the ECM connector.
Wire the ECM output wire to one of the trigger (signal) terminals of the relay. Supply
+12V to the other trigger (signal) wire using 18 gauge wire. The ECM will pull its output
low when activated to switch the relay on. Use a minimum 12 gauge wire from 12V
supply to relay SWITCHED terminals and to fan. Provide appropriate fuse protection per
fan manufacturer instructions.
SEE WIDEBAND O2 INSTALLATION FOR INSTRUCTIONS ON INSTALLING/
ADDING A WIRE INTO THE ECM CONNECTOR.