Switch Assembly

Make sure the plunger returns to its original position immediately after pressed-in then released.

Fig 1: Checking Plunger Returns

Be sure there is continuity between the terminals S and M, and between terminal S and ground. Use a circuit tester.

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

Terminal / Resistance: 

S - M/1 Ω or less 

S - Ground/1 Ω or less 

M - B/1 MΩ or more 

Fig 2: Checking Continuity Between Terminals S And M