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1998 RD688 service brake light switch


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I have an RD688 in the shop.  I have found three different air switches.  two of them turn on the brake light and low air light when crossed with jumper.  one does nothing.  it is on the back of the blue brake valve.  is that where i should be looking for the problem of no brake lights with service brake?

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The stop light switch is located on the engine firewall left of the rear valve cover, it is mounted in a small manifold with an air line coming to it.  The mack # is 1MR3544P2 or the new # is 25158791.

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