1. Relay check.
A) Using an ohmmeter, check for continuity between the terminals "1" And "2".
b) Using an ohmmeter, verify that there is no continuity between the leads "3" And "4".
If the conductivity does not match the above, replace the relay.
2. Checking the operation of the relay.
A) Lead to conclusions "1" And "2" battery voltage.
b) Using an ohmmeter, check for continuity between the leads "3" And "4".
If the conductivity does not match the above, replace the relay.