Time Relay

1975 GMC Magnavan 6.6L Eng VIN M, Automatic TransSECTION Time Relay

Remove coolant override switch connector. Check time relay to make sure it is cool. Turn ignition on. Vacuum advance solenoid should energize for 20 seconds and then de-energize. If solenoid does not de-energize, remove Blue lead from time relay. Solenoid will de-energize if relay is at fault.

Fig 1: TCS System (Not High Gear)
G09327420Courtesy of GENERAL MOTORS COMPANY
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.