Look on the transmission, passengers side, about half of the way up.
It is a fan shaped switch with a big nut at the bottom.
The cost about $300 new so I suggest cleaning yours first.
Remove the adjusting bolt at the top of the switch, and the wire connector, then hold the bolt still while you remove the large nut at the bottom, the bolt is connected to the gear shift and can be broken if it is moved against it's will.
take the switch to a bench and remove the screws in the back, then separate the halfs, clean out the nasty grease inside, pay special attention to the sweeper arm with the two brass contacts, they have little springs under them and they often get stuck down, remove the two contacts and springs and clean it all out really well, reassemble with new di-electric grease and reinstall on your Jeep.
Have someone move the selector to R and check to see if the back up lights are on, if so hold in place and have them move it to park and try to start, if it does then lock it down by tightening the top bolt.
If not then rotate the switch until the lights come on, and perform the park procedure to ensure the switch is aligned.
$300 !? I bought my switch for $73.10 at NAPA and installed it myself. Follow the excellent instructions above for finding it and disconnecting the old one. Hope this info is helpful.
Doesn't exist
The neutral/back up light switch is located on the passenger side of the transmission close to the rear corner of the housing. It is triangular in shape. Take it apart carefully and clean the contacts with contact cleaner.
If both are the same year (yes)
The headlight switch to the left of the steering wheel on the front of the dash acts as the dimmer. You spin the switch right or left depending on the intensity of the light you prefer.
under the passenger side of the car on the side of the transmission. it should be in between 2 small pipes.
The door ajar switch on the 2008 Ford Sport is located inside the door that is mounted on the backside.
It doesn't have EGR
in the fuel tank
The shift solenoid B is located on the engine section on the automatic transmission for the 98 Jeep Cherokee 4x4 Sport.
Jeep does not use inertia/reset switches.
stuck to the washer jug in the finder
Inside the gas tank.