DR-3B Transmission Unlock Relay Control Circuit

1. Turn ignition switch Off, then disconnect 14-way computer electrical connector.
2. Connect a voltmeter between cavity 3 of connector and ground, then turn the ignition switch to the Run position.
3. If voltmeter reading is within one volt of battery voltage, replace computer. Before replacing computer, ensure terminals in cavity 3 are making a good connection.
4. If voltmeter is not within one volt of battery voltage, locate and repair open circuit in wire between cavity 3 and unlock relay.