Ram B1500, B2500, B3500, 1999-2003

Neutral Safety Switch

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The neutral safety switch, otherwise known as the park/neutral position switch, prevents the vehicle from being started in any position other than PARK and NEUTRAL. It also functions as the back-up lamp switch.

The neutral safely switch is threaded into the transmission case. When the gearshift lever is placed in either the PARK or NEUTRAL position, a cam, which is attached to the transmission throttle lever inside the transmission, contacts the neutral safety switch and provides a ground to complete the starter solenoid circuit. The back-up light switch is incorporated into the neutral safety switch.

The center terminal is for the neutral safety switch and the two outer terminals are for the back-up lights.

There is no adjustment for the switch. If a malfunction occurs, the switch must be removed and replaced.

Removal & Installation





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Fig. Remove the switch using an appropriately sized socket



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Fig. The park/neutral position switch contains three terminals, and controls both the park/neutral function and the back-up lamps

  1. Raise and safely support the vehicle securely on jackstands.
  2.  
  3. Place a drain pan under the switch. A considerable amount of ATF will be lost unless the flow is stopped.
  4.  
  5. Label and disconnect the electrical harness.
  6.  
  7. Using the proper size wrench, unscrew the switch
  8.  

To install:

  1. Add the proper amount of ATF. If the flow was not stopped after switch removal, about four quart may have been lost, typically.
  2.  
  3. Move the selector lever to the PARK and NEUTRAL positions. Verify that the switch operating lever fingers are centered in the switch opening in the transmission.
  4.  
  5. Using a new seal, install the new switch and tighten it to 25 ft. lbs. (34 Nm).
  6.  
  7. Test the continuity of the switch, as outlined above.
  8.  
  9. Connect the electrical harness.
  10.  
  11. Lower the vehicle.
  12.  

Testing



  1. Disconnect the wiring connector at the switch.
  2.  
  3. With an ohmmeter, check for continuity between the center terminal and ground on the transmission case. Continuity should exist only in PARK and NEUTRAL .
  4.  
  5. Shift the transmission into REVERSE .
  6.  
  7. Check for continuity across the two outer terminals. It should exist only when the transmission is in REVERSE .
  8.  
  9. If the switch does not conform to these specifications, check gearshift linkage adjustment to ensure that the switch operating fingers are correctly positioned.
  10.  



Click image to see an enlarged view

Fig. Neutral safety switch location-typical

 
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