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1974 Models

  1. Block front wheels and apply parking brake. Start engine depress clutch pedal, and place transmission in high gear. Pull off vacuum hose to distributor. Vacuum should be felt.
  2. If vacuum is not present, check vacuum hoses for damage and replace if necessary. If there is still no vacuum, check high gear detecting switch. To do so, go to next step.
  3. Make sure wiring harness and connectors are in good condition. Disconnect harness from switch and connect ohmmeter to switch leads. Reading should be infinity with transmission in high gear, zero (0) in all other gear positions. If not, replace high gear detecting switch.
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