Hi and thanks for using 2CarPros.
Truly, it sounds like a bad starter. What I need you to do is follow this link. It shows how to determine if the starter is bad.
https://www.2carpros.com/articles/starter-not-working-repair
As far as the wire that you mentioned, I have no idea which wire it is. If you could upload a picture, it would be helpful.
If you determine the starter is bad, here is a link that shows how one is replaced:
https://www.2carpros.com/articles/how-to-replace-a-starter-motor
Here are directions specific to your vehicle. The attached pictures correlate with these directions.
REMOVAL AND INSTALLATION
REMOVAL
Warning: when performing maintenance on the starting system be aware that heavy gauge leads are connected directly to the battery. Make sure protective caps are in place when maintenance is complete.
Picture 1
1. Disconnect the battery ground cable.
2. Raise and support the vehicle.
Warning: the electrical power to the air suspension system must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch located in the rh kick panel area. Failure to do so may result in unexpected inflation or deflation of the air springs which may result in shifting of the vehicle during these operations.
Picture 2
3. Remove the starter motor solenoid terminal cover
The 4.6L Engine Is Shown; The 4.2L Engine Is Similar
Picture 3
4. Disconnect the starter motor electrical connections.
1 Remove the nuts.
2 Remove the battery cable.
3 Remove the starter solenoid wire.
The 4.6L Engine Is Shown; The 4.2L Engine Is Similar
Picture 4
5. Remove the (A) starter motor ground cable nut and the (B) starter motor ground cable.
The 4.2L Engine Is Shown; The 4.6L Engine Is Similar
Pic 5
6. Remove the starter.
1 Remove the two bolts.
2 Remove the starter.
INSTALLATION
Warning: when performing maintenance on the starting system be aware that heavy gauge leads are connected directly to the battery. Make sure protective caps are in place when maintenance is complete.
The 4.2L Engine Is Shown; The 4.6L Engine Is Similar
Picture 6
1. Install the starter motor.
1 Position the starter motor.
2 Install the two bolts.
The 4.6L Engine Is Shown; The 4.2L Engine Is Similar
Picture 7
2. Connect the (A) starter motor ground cable and install the (B) starter motor ground cable nut.
The 4.6L Engine Is Shown; The 4.2L Engine Is Similar
Picture 8
3. Connect the starter motor electrical connections.
1 Position the starter solenoid wire.
2 Position the battery cable.
3 Install the two nuts.
Picture 9
4. Install the starter motor solenoid terminal cover.
5. Lower the vehicle.
NOTE: If equipped with air suspension, reactivate the system by turning on the air suspension switch.
6. Connect the battery ground cable.
NOTE: When the battery is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 miles) or more to relearn the strategy.
________________________________
Let me know if this helps or if you need additional help.
Take care,
Joe
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Wednesday, January 20th, 2021 AT 12:49 PM
(Merged)