Question about 1995 GMC Sierra

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Just had transmission rebuilt, I install transmission and now it wont start. Battery is good. Could it be the neutral safety switch? What else could it be?

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  • mjohn57 Sep 05, 2010

    How can I ckeck the neutral switch to see if that is the problem.

  • mjohn57 Sep 05, 2010

    I did try to strat it in all postions no luck.

  • mjohn57 Sep 05, 2010

    If it is the switch, what test can I run to make sure it is the switch?

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That's my guess. you might loosen it to see if its out of adjustment.

Posted on Sep 05, 2010

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My 2004 freestar wont start battery good it used to start if i shifted it into neutral but now wont start in any gear


It should start in park and neutral .Their are safety switches to provident it from starting in gear. Like a clutch switch on a standard so you don't drive through your garage door .
The part is called an interlock switch typically mounted on the drivers side of the transmission.Also depending on if it is cable or electronic operated .Also could be the switch in the muilty function switches that control the shifting at the steering column

Sep 11, 2016 | 2004 Ford Freestar

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

New rebuilt Transmission,now have starting problem?


was the neutral safety switch adjusted try moving the shifter slowly threw the gears while turning the key that wilol show you YOU MUST KEEP YOUR FOOT ON THE BRAKE THE TRANS MAY NOT BE IN NEUTRAL WHEN THE SWITCH IS

Aug 11, 2012 | 2002 Chrysler PT Cruiser

2 Answers

Is the back up switch connected to the shifting linkage of the automatic transmission on my 1988 ford bronco II


If you have the C5 trans, here is the info:

C5 Transmission
  1. Disconnect the negative battery cable.
  2. Raise and support the vehicle safely.
  3. Remove the downshift linkage rod from the transmission downshift lever.
  4. Apply rust penetrant to the outer lever attaching nut to prevent breaking the inner lever shaft. Remove the transmission downshift outer lever attaching nut and lever.
  5. Remove the two neutral start switch retaining bolts.
  6. Disconnect the multiple wire connector.
  7. Remove the neutral start switch from the transmission.

To install:

  1. Install the neutral start switch on the transmission. Install the two retaining bolts.
  2. Adjust the neutral safety switch following the above procedure.
  3. Install the outer downshift lever and retaining nut, and tighten the nut. Install the downshift linkage rod with the retaining clips.
  4. Connect the wire multiple connector. Check the operation of the switch. The engine should start only with the transmission selector lever in N or P.

If it is the:
C3 And A4ld Transmissions
It's on the transmission....


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Neutral start switch and its location on the C3 and A4LD transmissions

May 12, 2011 | 1988 Ford Bronco II

2 Answers

86 olds Delta 88, just had trans rebuilt. Ran for a day and now won't start. Not the battery because lights and radio come on. Not making any noise when key is turned. Is this the starter??? Could...


It may just be loose wires like ground wires. The transmission has a wire that goes to the body of the car which serves as ground. Some of the wires including the ground may have come off.

Apr 17, 2011 | 1986 Oldsmobile Delta 88

2 Answers

Bronco wont start 88 ford bronco just replaced tranny and now won't start. i've hooked everything back up but one of the wires to the transfer case bc i broke the plug in. any ideas why it wont start...


The neutral safety switch is located on the side of the transmission and it is usually attached behind the shifter linkage and it is secured with two small bolts that can be loosened up to allow for adjustment of the neutral safety switch.

To adjust the neutral safety switch place the transmission into neutral, (block the tires) there is a notch or and indent marker on the housing of the neutral safety switch that should be lined up with a line on the face of the collar that is around the shifter detent shaft, and if they are not in alignment then loosen the two bolts that secure the neutral safety switch and then turn the neutral safety switch until they are aligned and then tighten the securing bolts to the neutral safety switch, and then test the starter. If the starter fails to engage then either the neutral safety switch is faulty, the neutral safety switch has been by-passed all this time and the by-pass (I will usually find things like a paper clip shoved into the vehicles wire connector with electrical tape around it) has fallen out of the wire connector from the vehicle wiring harness, or the battery just went dead. if you have the neutral safety switch from the old transmission still available try using it to test the neutral safety circuit. I have provided you with an image to help assist you adjust the neutral safety switch.


0b4222e.jpg

Jun 20, 2010 | 1988 Ford Bronco

2 Answers

Truck randomly won't start. No clicking, no nothing. Has a new battery, starter relay, ignition switch, etc. Someone told me to replace the clutch switch/neutral safety switch. I bought a neutral safety...


when it wont start, turn your headlights on, see if they work if they dont, find out why. When it wont start, take a wire from the positive battery terminal and touch it to the small post on the starter solenoid, it should crank. If it now cranks, theres a problem between the ign switch and the starter solenoid.

Jun 11, 2010 | 1984 Ford F 150

2 Answers

Where is the neutral safety switch on the 1995 Mercedes benz s500. My transmission was inspected and now my car won't start. The battery is good and we believe the starter is working as well


If it is old model of transmission - switch is on the left side of gearbox connected to shifting rod,
if it is new (electronic) transmission-switch is inside gear lever mechanism.

Oct 18, 2009 | 1995 Mercedes-Benz S-Class

2 Answers

Looking for the neutral safety switch


Neutral Safety/Back-up Light Switch

This is a combination switch which controls both Neutral Safety and Back-up lamp circuits.

C6 Transmission


8290dff.jpg

C6 neutral start switch
  1. Disconnect the negative battery cable.
  2. Raise and safely support the vehicle on jackstands.
  3. Remove the downshift linkage rod return spring at the low-reverse servo cover.
  4. Coat the outer lever attaching nut with penetrating oil. Remove the nut and lever.
  5. Remove the 2 switch attaching bolts, disconnect the wiring at the connectors and remove the switch.
  6. Installation is the reverse of removal. Adjust the switch and tighten the bolts to 55-75 inch lbs. (6.2-8.5 Nm).
  7. Remove the jackstands and lower the vehicle.
  8. Connect the negative battery cable.
AOD Transmission

e7f4231.jpg

Removing the AOD neutral start switch
  1. Disconnect the negative battery cable.
  2. Raise and safely support the vehicle on jackstands.
  3. Disconnect the wiring from the switch.
  4. Using a deep socket, unscrew the switch.
  5. Installation is the reverse of removal. Tighten the switch to 10 ft. lbs. (14 Nm).
  6. Remove the jackstands and lower the vehicle.
  7. Connect the negative battery cable.
4R70W Transmission

2f68dfc.jpg


Removing the Manual Lever Position (MLP) sensor

As of 1994, the neutral safety switch is referred to as a Manual Lever Position Sensor (MLP).
  1. Disconnect the negative battery cable.
  2. Raise and safely support the vehicle on jackstands.
  3. Disengage the harness connector from the MLP sensor.
  4. Remove the 2 sensor attaching bolts and remove the sensor.
To install:
  1. Install the MLP sensor and install retaining bolts. Do not tighten, the sensor requires adjustment.
  2. Adjust the MLP sensor then tighten attaching screws to 80-100 inch lbs. (9-11 Nm).
  3. Remove the jackstands and lower the vehicle.
  4. Connect the negative battery cable.


ADJUSTMENT

C6 Transmission
  1. Hold the steering column transmission selector lever against the Neutral stop.
  2. Move the sliding block assembly on the neutral switch to the Neutral position and insert a 0.091 in. (2.3mm) gauge pin in the alignment hole on the terminal side of the switch.
  3. Move the switch assembly housing so that the sliding block contacts the actuating pin lever. Secure the switch to the outer tube of the steering column and remove the gauge pin.
  4. Check the operation of the switch. The engine should only start in Neutral and Park .

4R70W Transmission


4cc4151.jpg


Adjusting the MLP sensor

Park is the last detent when the manual control lever is full forward. Return 2 detents toward the output shaft for Neutral.
  1. Position the manual control lever in Neutral .
  2. Insert Gear Position Sensor Adjuster tool T93P-700 10-A or equivalent, into the slots.
  3. Align all 3 slots on the MLP sensor with 3 tabs on the tool.
  4. Tighten the attaching screws to 80-100 inch lbs. (9-11 Nm).

I hope help you. Good luck (rated this help).

Sep 17, 2009 | Ford E-250 Cars & Trucks

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