Field Relay

Remove regulator cover and connect a carbon pile rheostat from battery positive post to regulator "S" terminal. Connect battery negative post to regulator base. Connect a voltmeter from regulator "S" terminal to regulator base. Slowly rotate resistance control so relay contacts close. Note voltmeter reading at the moment contacts close. This is relay closing voltage and should be 2.5-4 volts. If relay closes immediately, even with field resistance out of circuit, use a 6-volt battery and retest. If field relay closing voltage is not within limits, bend relay frame (spring arm) down to increase voltage, and up to decrease voltage.