Switch Assembly

Using a circuit tester (set in Ω), check that there is continuity between terminals S and M, and between terminal S and ground.

Also check to be sure there is no continuity between terminal M and B.

Terminal / Resistance: 

S - M/1Ω or less 

S - Ground/1Ω or less 

M - B/1MΩ or more 

Fig 1: Checking Continuity Between Terminals S And M, And Terminal S And Ground