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Neutral Safety Switch: Testing

  1. Center terminal of 3-pin neutral safety and back-up light switch provides ground for starter solenoid circuit through shift lever in Park or Neutral 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 which tests bad.
  3. Back-up light switch circuit is through 2 outside terminals of switch. Continuity should exist between 2 terminals only when transmission is in Reverse. Continuity should not 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 Neutral. Ensure switch operating fingers are centered in switch opening in case.
  5. Install and tighten switch with NEW seal into case. Check transmission fluid level.
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