How to check and replace the Neutral Safety Switch on the Mercury Grand Marquis?

For 1988 through 1991 models and 1992 models with AOD transmission, to check the operation of the neutral start switch, apply the parking brake and attempt to start the engine in each position of the selector lever; the engine should only start in Park and Neutral. If it starts in any other position, adjust the shift linkage and retest. If the engine still starts in any position other than Park or Neutral, replace the switch. To replace the switch, disconnect the cable from the negative battery terminal, place the shift lever in Low, and apply the parking brake. Raise the vehicle and secure it on jackstands, then unplug the electrical connector from the neutral start switch. Carefully remove the switch and O-ring, install the new switch and O-ring, and tighten it. Reinstall the electrical connector and reconnect the negative battery cable. Verify that the engine starts only when in Park or Neutral. For 1992 models with AODE transmission and all 1993 and later models, note that the AODE and 4R70W transmissions do not have a neutral switch; this function is incorporated into an information sensor known as the Manual Lever Position (MLP) sensor or, for 1995 and later models, the Transmission Range (TR) sensor. For adjustment details, consult the relevant information.

Genuine Mercury Grand Marquis Neutral Safety Switch

Transmission Neutral Safety Switch

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6 Neutral Safety Switches found

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Mercury Grand Marquis Sensor - Man. Lever Position - Mlps
Part Number: F8AZ-7F293-AA
$69.31 MSRP: $110.55
You Save: $41.24 (38%)
Product Specifications
- Other Name: Neutral Safety Switch, Range Sensor
- Manufacturer Note: Digital TRS, FROM 11/10/97
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1998-2011 Mercury Grand Marquis | 8 Cyl 4.6L, 8 Cyl 4.6L Romeo SOHC EFI | 4AT 4R70W, 4-Speed Automatic Transmission 4R75E Livonia, Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Grand Marquis Switch - Neutral Sensing
Part Number: FOVY-7A247-A
Product Specifications
- Manufacturer Note: 4 PRONG CONN.
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1980-1992 Mercury Grand Marquis | 8 Cyl 4.2L, 8 Cyl 4.6L, 8 Cyl 5.0L, 8 Cyl 5.8L | 3AT, 3AT C4, 3AT C6, 4AT, 4AT AOD, 4AT AODE
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Mercury Grand Marquis Switch Assembly - Starter Inhibitor
Part Number: F5AZ-7A247-A
Product Specifications
- Other Name: Switch Assy - Starter Inhibitor
- Replaced by: F5AZ-7A247-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1992 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT, 4AT AOD, 4AT AODE
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Mercury Grand Marquis Switch Assy - Starter Inhibitor
Part Number: D6RY-7A247-B
Product Specifications
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1980-1986 Mercury Grand Marquis | 8 Cyl 4.2L, 8 Cyl 5.0L, 8 Cyl 5.8L | 3AT, 3AT C4, 3AT C6, 4AT AOD
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Mercury Grand Marquis Sensor - Man. Lever Position - Mlps
Part Number: F5VY-7F293-AA
Product Specifications
- Other Name: Range Sensor
- Manufacturer Note: 4.6L, BEFORE 11/10/97
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1996-1998 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT 4R70W
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Mercury Grand Marquis Switch - Neutral Sensing
Part Number: E2DZ-7A247-A
Product Specifications
- Other Name: Back-Up Switch, Neutral Safety Switch
- Manufacturer Note: TRANS:C5 *SW-1745, replaces E27P 7A247-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1980-1986 Mercury Grand Marquis | 8 Cyl 4.2L, 8 Cyl 5.0L, 8 Cyl 5.8L | 3AT, 3AT C4, 3AT C6, 4AT AOD

Mercury Grand Marquis Neutral Safety Switch

The Neutral Safety Switch of a Mercury Grand Marquis blocks the engine from starting. In fact, it only allows the engine to start if the shift lever is in either park or neutral. The Neutral Safety Switch interrupts the starter circuit when the transmission is in drive or reverse to prevent the huge sedan from lunging unexpectedly. Thus, it protects the driver, passengers, and traffic. Within the Grand Marquis, the Neutral Safety Switch connects the ignition key with the starter motor. This switch gauges the gear selector's position and only passes power under safe conditions. Older Mercury editions incorporated a merely mechanical plunger, which was directly linked to the column shifter. The newer Grand Marquis applied the same basic principle. However, what was entirely different was that their Neutral Safety Switch was more compactly packaged. This was done in the transmission range selector. This was done as it was more durable and easier to replace across the broader Mercury family. The Neutral Safety Switch, regardless of build year, serves the same locking out function that guarantees a predictable, drama-free startup for all Mercury owners of the venerable Grand Marquis.

We provide a wide range of Mercury Grand Marquis Neutral Safety Switch at the optimal prices. If you need Mercury Grand Marquis Neutral Safety Switch, you can shop with confidence on our website. All our OEM parts come with a manufacturer's warranty and are delivered to your doorstep with a fast delivery service.

Mercury Grand Marquis Neutral Safety Switch Parts Questions & Experts Answers

Sensor - Man. Lever Position - Mlps
F8AZ-7F293-AA
Q: How to check and replace the Neutral Safety Switch on the Mercury Grand Marquis?
A:
For 1988 through 1991 models and 1992 models with AOD transmission, to check the operation of the neutral start switch, apply the parking brake and attempt to start the engine in each position of the selector lever; the engine should only start in Park and Neutral. If it starts in any other position, adjust the shift linkage and retest. If the engine still starts in any position other than Park or Neutral, replace the switch. To replace the switch, disconnect the cable from the negative battery terminal, place the shift lever in Low, and apply the parking brake. Raise the vehicle and secure it on jackstands, then unplug the electrical connector from the neutral start switch. Carefully remove the switch and O-ring, install the new switch and O-ring, and tighten it. Reinstall the electrical connector and reconnect the negative battery cable. Verify that the engine starts only when in Park or Neutral. For 1992 models with AODE transmission and all 1993 and later models, note that the AODE and 4R70W transmissions do not have a neutral switch; this function is incorporated into an information sensor known as the Manual Lever Position (MLP) sensor or, for 1995 and later models, the Transmission Range (TR) sensor. For adjustment details, consult the relevant information.