Will not turn over

Hi,

Since you replaced the range sensor, does it still show drive? I attached a picture from the starting system wiring schematic. The pic indicates fuses that power the switch. Check the ones I circled. Also, make sure there is power out of the range sensor, tan/red wire. Also, I need you to check the relay itself.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Let me know what you find.

Joe

If it still indicates drive regardless of gear position, are you sure the linkage cable to the transmission is moving? I ask because there is always power through the range sensor. Voltages change based on gear selection. Based on the voltage changes, the powertrain control module identifies what gear the vehicle is in Since the new switch hasn't made a difference, either the linkage isn't moving the shift lever or something has corroded and not moving the RS.

Here are directions for shift cable adjustment. I'm adding these so you can confirm it is working properly and is actually changing the gears. The attached pics correlate with the directions.

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2005 Mercury Truck Mariner 4WD V6-3.0L VIN 1
Cable Adjustment - Shift Indicator
Vehicle Transmission and Drivetrain Automatic Transmission/Transaxle Adjustments Cable Adjustment - Shift Indicator
CABLE ADJUSTMENT - SHIFT INDICATOR
Selector Lever Cable Adjustment

pic 1

1. Place the floor shift selector lever in the (D) position.

Pic 2

2. Loosen the bolt for the Z-bracket and rotate the Z-bracket counterclockwise to allow access to the shift cable bracket.

Pic 3

3. Loosen the gearshift cable adjuster to adjust the cable by turning it turn counterclockwise.

Pic 4

4. Place the transmission manual control lever in the DRIVE position.

Pic 5

5. Tighten the cable adjustment ring by turning it clockwise turn.

Pic 6

6. Rotate the Z-bracket clockwise over the shift cable end fitting.
Tighten to 9 Nm (80 inch lbs.).

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Let me know.

Joe

Here are the directions for replacement of the sensor. Take a look through them to confirm you got it together correctly. The vehicle still thinks it is in drive, so for some reason, the range sensor isn't moving or there are other issues.

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2005 Mercury Truck Mariner 4WD V6-3.0L VIN 1
Removal and Replacement
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Transmission Position Sensor/Switch Service and Repair Removal and Replacement
REMOVAL AND REPLACEMENT
Transmission Range (TR) Sensor

pic 1

Special Tool(s)

Removal
1. With the vehicle in NEUTRAL, position it on a hoist.
2. Remove the battery and tray.

Pic 2

3. Remove the Transmission Range (TR) sensor.
1 Disconnect the TR sensor electrical connector.
2 Remove the TR sensor retaining bolts.
3 Remove the TR sensor.

Installation

pic 3

1. NOTE: Make sure the transaxle is in the NEUTRAL position.

Install the TR sensor and loosely install the bolts.

Pic 4

2. Using the special tool, align the TR sensor and tighten the bolts.
Tighten to 12 Nm (9 ft. Lbs.).

Pic 5

3. Connect the TR sensor electrical connector.
4. Install the battery and tray.
5. Check the correct operation. The engine should start only in PARK or NEUTRAL. The reverse lamps should illuminate in the REVERSE position.

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Let me know. If you feel it was properly installed, see if it will crank in any other position. Just make sure your foot is on the brake.

Joe

I have one last thing to check. Remove the sensor and manually turn it to see if you get reverse lights and if it will start. Either something is preventing it from turning or we have a totally different issue.

Let me know.

Joe

If the light didn't change, we have an wiring issue. You can try it to see if it works, but I suspect it won't.

Let me know. Also, reconfirm the connector is in good condition and no pins are pushed in or damaged.

Joe

I know there is a large wire splice near the battery. Are the wires white with a red tracer? Tale a look at the schematic I attached. If possible, take a pic of what you see and upload it so I can look at it.

Joe

Wow, they look rough. And the broken one is white with a red tracer. I'm glad you got if going again. Sorry for the delayed response. I ended up in the Hospital for a couple days. I just got home a few hours ago.

If I was of help, you are very welcome. Please feel free to come back any time in the future if you have questions.

Take care,
Joe

I'm now in my 50's, so it doesn't seem to be getting any better. There is always something new. LOL

Regardless, I'm glad it's running. Enjoy it!

Take care and hope you come back if you need anything.

Joe