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Neutral Safety Switch: Testing

  1. Center terminal of 3 terminal neutral safety and back-up light switch provides ground for starter solenoid circuit through shift lever in Park or Neutral positions only.
  2. To test, remove wiring connector from switch and check for continuity between center pin of switch and case. Continuity should exist only when transmission is in Park or Neutral.
    NOTE: Check shift linkage adjustment before replacing a switch that tests bad.
  3. The back-up light switch circuit is through the 2 outside terminals of the switch. Continuity should exist between the 2 terminals only when transmission is in reverse. No continuity should exist from either terminal to case.
  4. To replace, unscrew switch from case (some fluid will escape). Move gear selector lever to Park, and then to Neutral position. Check to see that switch operating fingers are centered in switch opening in case.
  5. Install switch with new seal into case and tighten. Check transmission fluid level.
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