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Magnet Switch

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Using a circuit tester, check there is continuity between S terminal and M terminal, and between S terminal and ground.

Also, check that there is no continuity between terminal M and terminal B.

G14601629Courtesy of SUBARU OF AMERICA, INC.
Terminals Standard
Terminal S - terminal M 1 Ω or less
Terminal S - Ground 1 Ω or less
Terminal M - terminal B 1 MΩ or more