Circuit Continuity Checks

Disconnect the battery terminal or connector so there is no voltage between the check points.
Contact the two leads of an ohmmeter to each of the check points.

If the circuit has diodes, reverse the two leads and check again.
Use an ohmmeter to check for diode continuity. When contacting the negative lead to the diode positive side and the positive lead to the negative side, there should be continuity.
When contacting the two leads in reverse, there should be no continuity.

Fig 1: Checking Diode Continuity Using Ohmmeter
Courtesy of SUBARU OF AMERICA, INC.
The symbol " " indicates that continuity exists between two points or terminals. For example, when a switch position is at "3", continuity exists among terminals 1, 3 and 6, as shown in the table below.

Fig 2: Switch Position Continuity Reference Chart

Courtesy of SUBARU OF AMERICA, INC.