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Vacuum Switch A

  1. Disconnect vacuum hose No. 2 to control box at vacuum hose manifold. Connect a hand vacuum pump to hose. Check for continuity between Black/Yellow and Brown/White terminals of control box connector.
  2. Apply over 4 in. Hg vacuum. Continuity should not be present. If present, replace vacuum switch A. Release vacuum. There should be continuity. If not, replace vacuum switch A.
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