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NEUTRAL SAFETY/BACK-UP LIGHT SWITCH

R3A

Fig. 1: Neutral safety/back-up light switch adjustment on the R3A transmission

The switch is located at the base of the shift lever.

  1. Remove the housing from the shift lever.
  2. Adjust the shift lever so that there is 0–0.3mm (0–0.0118 in.) clearance between the pin and guide plate when the lever is in NEUTRAL.
  3. Loosen the retaining screws and adjust the neutral safety switch so that the pin hole in the switch aligns with the pin hole in the sliding plate with the lever in NEUTRAL.
  4. At this point, the engine should start only in PARK or NEUTRAL, and the back-up lights should come on only in REVERSE.
  5. If the switch is defective, replace it by removing the retaining screws and disconnecting the wiring.
3N71B

Fig. 2: Neutral safety/back-up light switch adjustment on the 3N71B transmission

The switch is located on the right side of the transmission case.

  1. Adjust the shift linkage.
  2. Place the transmission shift rod in Neutral (3rd detent from the rear of the transmission).
  3. Remove the transmission shift rod retaining nut and disconnect the rod from the switch.
  4. Loosen the switch attaching bolts. Remove the screw from the alignment pin hole at the bottom of the switch.
  5. Rotate the switch and insert an alignment pin, 1.5mm (0.059 in.) diameter into the alignment pin hole and internal rotor.
  6. Tighten the two switch attaching bolts and remove the alignment pin.
  7. Reinstall the alignment pin hole screw in the switch body.
  8. Connect the shift rod.
  9. Check the operation of the switch. The engine should start, only with the transmission selector lever in Neutral or Park. The back-up lights should come on, only with the lever in Reverse.
  10. If the switch is defective, replace it by simply removing the attaching screws and disconnecting the wiring.

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