Field Relay
With relay disconnected from alternator and regulator circuits, make test connections as shown in illustration. With field rheostat control in maximum counterclockwise position, slowly rotate control clockwise until test light comes on, note voltmeter reading at this point
CAUTION:
(If relay closes immediately and test light comes on with rheostat close to maximum counterclockwise position, press red button between meters and repeat test. If closing voltage is not within limits (see Specifications), replace relay.