Power and Ground Distribution: Testing and Inspection

Power Relay Test

Use this chart to identify the type of relay, then do the test listed for it.




Normally-open type

Check for continuity between the terminals.

- There should be continuity between the No.1 and No.2 terminals when battery positive terminal is connected to the No.4 terminal, and battery negative terminal is connected to the No.3 terminal.
- There should be no continuity between the No.1 and No.2 terminals when power is disconnected.




Five-terminal type

Check for continuity between the terminals.

- There should be continuity between the No.1 and No.2 terminals when battery positive terminal is connected to the No.5 terminal, and battery negative terminal is connected to the No. :3 terminal.
- There should be continuity between the No.1 and No.4 terminals when power is disconnected.