DR-21B SYNC Pick-Up Circuit to Logic Module

1. Place ignition switch in Run position, then connect a voltmeter between terminal No. 17 of logic module blue electrical connector and ground.
2. If voltmeter indicates at least 8 volts, check wiring from terminal No. 17 to distributor sync pick-up for an open circuit.
3. If voltmeter indicates no voltage, replace logic module.