B Series Truck L4-2184cc 2.2L 2200 (1988)
EFE Relay: Testing and Inspection
Fig. 45 Testing PTC heater relay.
1.
Connect battery ground to No. 2 terminal of relay electrical connector and battery positive to No. 1 terminal and ensure continuity exists between
connector terminals 3 and 4, Fig. 45.
2.
Remove voltage from connector and ensure there is no continuity between terminals 3 and 4.
