Chrysler Full-Size Vans 1967-1988 Repair Guide

Neutral Start Switch


See Figures 1 and 2

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Fig. Fig. 1: Single wire neutral safety switch

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Fig. Fig. 2: Neutral safety switch location-three wire switch (incorporates the back-up light switch as well) shown


The neutral safety switch is thread mounted 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, contact 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 lamps.

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


See Figure 3

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Fig. Fig. 3: Disconnect the wire harness from the back-up light/neutral safety switch before removal

  1. Disconnect the electrical leads and unscrew the switch. Use a drain pan to catch the transmission fluid.
  3. Using a new seal, install the new switch and torque it to 24 ft. lbs.
  5. Pour four quarts of ATF+3® II fluid through the filler tube.
  7. Start the engine and idle it for at least 2 minutes.
  9. Set the parking brake and move the selector through each position, ending in Park.
  11. Add sufficient fluid to bring the level to the FULL mark on the dipstick. The level should be checked in Park, with the engine idling at normal operating temperature.