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A/T Models

  1. Disconnect vacuum hose No. 15 to vacuum switch C and connect vacuum pump to hose. Apply vacuum to switch. Check for continuity between Black/Yellow and Blue/Black wire terminals of control box 6P connector.
  2. Continuity should be available when a vacuum above 12 in. Hg is applied and no continuity when vacuum is released. If not within specifications, replace vacuum switch C and retest.
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