Don't know if your switch is made this way, but most of the five or six blade Indak type switches have the terminals labeled with a letter. With the key in the run position, you will have continuity between the B and R and A terminals. When key is in off position, you will have no continuity between those terminals and the M terminal will have continuity to ground. When key is in start position, you will have continuity between the B and S terminals. You could run a volt meter hooked to the R and A terminals and not have constant voltage when key is in off position if your switch is set up this way.