Chevrolet Full-size Cars 1968-1978 Repair Guide

Neutral Safety Switch

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The neutral safety/back-up light switch on automatic transmissions is combined in a single unit. The switch prevents the engine from being started in any transmission position except Neutral or Park. The switch is located on the upper side of the steering column under the instrument panel on column shift vehicles, and inside the shift console on floor shift models.

REMOVAL & INSTALLATION





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Fig. Fig. 1 Installation of the neutral safety switch



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Fig. Fig. 2 Column mounted back-up light switch

  1. Remove the console for access on floor shift models.
  2.  
  3. Disconnect the electrical connectors.
  4.  
  5. Remove the neutral switch.
  6.  
  7. Place 1968-70 column shift lever models in Drive, and 1971-78 models in neutral. Locate the lever tang against the transmission selector plate on column shift models. Place 1968-72 floor shift models in Drive, and mid-1972-78 models in Park.
  8.  
  9. Align the slot in the contact support with the hole in the switch. Insert a 1 / 32 " pin in place. The switch is now aligned in Drive position.
  10.  

1973-78 neutral safety switches have a shear-pin installed to aid in proper switch alignment so that insertion of a pin is unnecessary. Moving the shift lever from Neutral shears the pin.

  1. Place the contact support drive slot over the drive tang. Install the switch mounting screws.
  2.  
  3. Remove the aligning pin. Connect the electrical wiring, and replace the console.
  4.  
  5. Set the parking brake and hold your foot on the service brake pedal. Check to see that the engine will start only in Park or Neutral.
  6.  

ADJUSTMENT



  1. Place shift lever in Neutral.
  2.  
  3. Move the switch until you can insert a gauge pin, 0.0972 in. into the hole in the switch and through to the alignment hole.
  4.  
  5. Loosen the switch securing screws. Remove the console first, if necessary.
  6.  
  7. Tighten the screws and remove the pin.
  8.  
  9. Step on the brake pedal and check to see that the engine will only start in Neutral or Park.
  10.  

 
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