Relay Tests

Remove both connectors to perform relay tests. Verify that terminal B  on each relay is grounded. If each relay is not grounded, check relay cases to ground bolts for tightness. If bolts are tight replace the relay. Apply power to terminals A  and C  on each relay and connect a 12 volt test light between terminal B  and ground (no longer than 2 minutes). Test light should light; if not replace relay.

Fig 1: Ford, Mercury, Meteor Vacuum Door Locks

Courtesy of FORD MOTOR CO.

Fig 2: Thunderbird, Mark IV Electric Door Locks

Courtesy of FORD MOTOR CO.

Fig 3: Testing Lock Relay

Courtesy of FORD MOTOR CO.

Fig 4: Lincoln Continental Vacuum/Electric Door Locks

Courtesy of FORD MOTOR CO.