Question about 2002 Mercury Grand Marquis

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How do I replace or adjust the neutral safety switch.

The car will not start in park but will start in neutral.

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  • Mercury Master
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Check the brake lights first. The transmission range switch does not usually need adjusted unless the linkage bushings are worn or broken. The brake light switch ,however, can be bad or have a broken wire and cause the car not to start in park.

Posted on Mar 31, 2015

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  • Master
  • 352 Answers

Before you adjust switches, get the car on a lift and be sure the shift linkage is tight. If the linkage is worn, the car may not be fully in park even though the lever and indicator look like the car is in park.

The switch is on the transmission. You should be able to see it when the car is on the lift.

Posted on Mar 31, 2015

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2 Answers

Why do I have to wiggle it around in neutral to get it to start again?


sounds like the neutral safety switch. i have replaced a few on ford trucks. after a while they tend to wear out or get out of adjustment. but if you wiggle it around and it starts. my guess is the neutral safety switch. you didn't specify what kind of vehicle you have but there are a lot of videos on you tube that may show you how to do this. good luck

Jan 18, 2016 | Cars & Trucks

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How do I adjust the neutral safety switch on a 1992 ford explorer lt automatic 2wd w/a 4.0L engine


There is a small amount of adjustment by loosening the screws and turning the switch a bit. If that doesn't work then the contacts in the switch are burned and needs to be replaced.

Oct 01, 2014 | 1992 Ford Explorer

1 Answer

My 2001 Jeep Grand Cherokee wont start sometimes, but if I put it in neutral then try to start it..It starts .. What is the problem with my baby.......


Test/Service/Replace

The circuit on newer cars with automatic transmissions has a neutral safety, or neutral start switch installed between the ignition switch and the starter. The ignition switch cannot operate the starter motor unless the transmission is in park or neutral.
Late model vehicles with manual transmissions have a starter/clutch interlock switch that requires the clutch to be depressed to the floor.
Neutral Safety Switch
Normal operations of a neutral safety switch provides a quick check for the adjustment of the gear selector linkage.
  • To do this, move the selector slowly until it clicks into the PARK position.
  • Turn the ignition key to the START position.
  • If the starter operates, the PARK position is correct.
  • After checking the PARK position, move the lever slowly toward the NEUTRAL position until the lever drops at the end of the NEUTRAL stop in the selector gate.
  • If the starter also operates at this point, the gearshift linkage is properly adjusted.
  • This quick test also tests the adjustment of the neutral safety switch.
  • If the engine does not start in either or both of these positions, the neutral safety switch or the gear selector linkage needs adjustment or repair.

CAUTION
Since you must work under the vehicle to adjust most shift linkages make sure you properly raise and support the vehicle before working under it. Also, wear safety glasses or goggles while working under the vehicle.
A voltmeter can be used to check the switch for voltage when the ignition key is turned to the START position with the shift lever in PARK or NEUTRAL. If there is no voltage, the switch should be adjusted or replaced.

Jan 26, 2013 | 2002 Jeep Grand Cherokee

1 Answer

2004 ranger will not start in park


Sound like a problem with the Safety Neutral Switch, its possible that need adjustement. Keep in touch.

Hope this helps.

Jun 20, 2012 | 2004 Ford Ranger

1 Answer

Put a new engine in a 1998 isuzu rodeo now it won't start. I thought it was the neutral safety switch because the R was on the dash and it was in park


This could be the problem. If your dash indicator is showing reverse but the transmission is in park it could be the safety switch. I'm not talking about the safety switch in the transmission though. In automatics they put a second switch to kill the starter from engaging. You need to adjust the linkage. If your shifter isn't actually on the column but the indicators are there is a cable that attaches the floor shift to the column and that is adjustable. Put the Floor shifter in Park and turn the column section nearest the dash by hand until you find park. Then adjust the cable length as needed. If all you have is the column shift it is still a cable adjustment. Set the emergency brake, drop the shifter to low 1 and adjust the cable linkage by loosening it on the transmission and manually move it all the way to low 1 then tighten it down then move the shifter to park and repeat teh adjustment process to verify that it is properly aligned. Lock the linkage back down and see if the vehicle will start, if it doesn't move the shifter to neutral and try to start the vehicle if the vehicle starts then check the column shift safety switch at the park position to make sure it is still in place and working. Typically, if the vehicle won't start in Park or Neutral it is more likely to be the Transmission neutral safety switch.

Nov 15, 2011 | 1998 Isuzu Rodeo

2 Answers

My 2001 f150 4x4 will not start unless i hole the gear shift up while in park. what is the cause of this??


You probably need a linkage adjustment,a neutral safety switch adjustment or replacement of the neutral safety switch.

Mar 06, 2011 | 2001 Ford F150 Styleside SuperCrew

2 Answers

When I have a no start condition I work the maul selector from park to low 1 back and forth and the car starts


Your safety interlock switch is going out or is not adjusted properly. There is a procedure for adjusting the switch. The switch is on the transmission in the engine compartment. If you want to adjust the switch, loosen the botls holding the switch and follow steps 7-8 below. Else, you can just replace the switch entirely by following all steps.

The neutral start and backup switch are one unit mounted on the top left end of the transaxle. The neutral start portion of the switch allows electrical current to travel to the ignition system when the shift selector is in park or neutral only. The vehicle will not start when the selector is in any other gear. The backup portion operates the rear backup lamps when selector is in the reverse gear.


REMOVAL & INSTALLATION See Figures 1 and 2

  1. Make sure the shift selector in the Park position, then apply the emergency brake.
  2. Disconnect the negative battery cable.
  3. Disengage the neutral start switch electrical connector, then remove the shift control lever on top of the switch.
  4. Remove the two neutral switch attaching bolts, then remove the switch.

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Fig. Fig. 1: Neutral safety switch location-vehicles equipped with automatic transaxle

8bf90b7.gif

Fig. Fig. 2: Adjusting the neutral safety switch



To install:

  1. Install the switch on the manual shaft.
  2. Loosely install the two attaching bolts and washers.
  3. Insert a No. 43 drill (0.089 in.) through the hole.
  4. Tighten the attaching bolts to 7-9 ft. lbs. (9-12 Nm), then remove the drill.
  5. Engage the switch electrical connector, then connect the negative battery cable.

Sep 22, 2010 | 1992 Ford Taurus

2 Answers

How to replace neutral saftey switch on a 1980 cadillac deville?


Use like reference guide for GM Cadillac 1967-1989 Repair Guide Neutral Safety Switch - REMOVAL & INSTALLATION

All Except 1985-89 Eldorado and Seville
See Figure 1
The neutral safety switch prevents the engine from being started in any transmission position except Neutral or Park. The switch is located on the upper side of the steering column under the instrument panel on column shift cars, and inside the shift console on floor shift models.
  1. Remove the console for access on floor shift models.
  2. Disconnect the electrical connectors.
  3. Remove the neutral switch.

To install:
  1. Place 1967-70 column shift lever models in Drive, and 1971 and later models in neutral. Locate the lever tang against the transmission selector plate on column shift models.
  2. Align the slot in the contact support with the hole in the switch. Insert a 3 / 32 in. (2.38mm) diameter pin in place. The switch is now aligned in Drive position.

1973 and later neutral safety switches have a shear-pin installed to aid in proper switch alignment so that insertion of a pin is unnecessary. Moving the shift lever from Neutral shears the pin.
  1. Place the contact support drive slot over the drive tang. Install the switch mounting screws.
  2. Remove the aligning pin. Connect the electrical wiring, and replace the console.
  3. Set the parking brake and hold your foot on the service brake pedal. Check to see that the engine will start only in Park or Neutral.
7b3f2a9.jpg

Fig. 1: Installation of a common neutral safety switch



ADJUSTMENT
See Figure 2
1974 and later cars do not have a neutral safety switch. Instead, these cars have an interlock between the lock and the transmission selector, which is non-adjustable.
  1. Place the shift lever in Neutral.
  2. Move the switch until you can insert a gauge pin, 3 / 32 in. (2.38mm) diameter, into the hole in the switch and through to the alignment hole.
  3. Loosen the switch securing screws. Remove the console first, if necessary.
  4. Tighten the screws and remove the pin.
  5. Step on the brake pedal and check to see that the engine will only start in Neutral or Park.
05843d3.jpg


Fig. 2: Adjustment of a common neutral safety switch


1985-89 Eldorado and Seville
See Figure 3

All neutral safety/back-up light switches come with a small plastic alignment pin installed. Leave this pin in place.
  1. Place the shifter assembly in the Neutral position.
  2. Remove the shifter lever-to-switch nut and the lever.
  3. Disconnect the electrical connector from the neutral safety/back-up light switch.
  4. Remove the neutral safety/back-up light switch-to-transaxle bolts and the switch from the vehicle.

To install:
  1. Position the shifter shaft in the Neutral position.

If using an old switch or the plastic pin (new switch) is broken, install a3/32in. (2.38mm) diameter pin gauge (drill bit) into the neutral safety/back-up light switch; the switch is then locked into its Neutral position.
  1. Align the flats of the shifter shaft and the neutral safety/back-up light, then, align the switch-to-tang on the transaxle. Torque the switch-to-transaxle bolts to 22 ft. lbs. (30 Nm). Remove the pin gauge.
  2. To complete installation, reverse the removal procedures. Make sure that the engine starts only in the Park and Neutral positions.
c796664.jpg

Fig. 3: Neutral start and back-up lamp switch - 1985-89 Eldorado and Seville

Hope help with this (remember rated and comment this). Good luck.

Mar 21, 2010 | 1980 Cadillac Deville

1 Answer

Car will NOT start in park but will start in neutral


It sounds like you new switch needs adjusted just a little bit.

Feb 25, 2009 | 2000 Dodge Durango

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