DR-13B Radiator Fan Relay Control Wire

1. Turn ignition switch Off, then connect a voltmeter to cavity 21 of logic module red connector and to ground.
2. Turn ignition switch to Run position.
3. If voltmeter indicates voltage is within one volt of battery voltage, replace logic module.
CAUTION: Before replacing the logic module check the terminal in cavity No. 21 of the red connector to make sure it is not crushed causing a poor connection.
4. If voltmeter indicates voltage is zero to seven volts, repair open circuit in wire to radiator fan relay in cavity 21.