DR-28C Radiator Fan Relay Control Circuit

This test must be performed with engine at normal operating temperature.
1. Turn ignition switch to the Off position. Disconnect computer 10-way connector, then connect a voltmeter to terminal No. 8 and ground.
2. Turn ignition switch to the Run position. Voltmeter should read within 1 volt of battery voltage.
3. If voltage reading is satisfactory, ensure terminal No. 8 pins make proper contact with computer pin. If terminals are good, replace computer.
4. If voltage reading is unsatisfactory. Repair open circuit from terminal No. 8 to radiator fan relay.