1977 Models
Remove relay from vehicle. Apply 12 volts across terminals No. 1 and 3 (3 and 4 on F10). See Figure. With voltage applied, continuity should exist between terminals No. 2 and 4 (1 and 2 on F10). If results are incorrect, replace relay.
Remove relay from vehicle. Apply 12 volts across terminals No. 1 and 3 (3 and 4 on F10). See Figure. With voltage applied, continuity should exist between terminals No. 2 and 4 (1 and 2 on F10). If results are incorrect, replace relay.