Remove 16 Amp fuse from fuse box.
Disconnect cables from relay, then remove relay.
Apply 12 Volts to relay terminals A-H and test terminals E-G for circuit with an ohmmeter.
Apply 12 Volts to relay terminals B-H (battery positive to terminal B) and test terminals E-F and C-D for circuit with an ohmmeter.
If an open circuit is found during tests 3 and 4, the relay must be replaced with a new one.