Where cant find backup light switch

Did you check the backup light switch ?

Back up light switch is located in the shifter area. remove cover ,you will see the switch where the shifter hits the switch to cause the lights to work.

Is it possible you did not get it adjusted correctly ?

The neutral safety switch which also powers the backup lights is a black switch mounted on a metal plate, so I would guess it is mounted to the shifter or the transmission. If you have a column shift check the bottom of the column, if it is in the console look around near the shifter.
Otherwise it would be on the transmission near the shift lever.

I would say that the backup light switch on the transmission is faulty, or the wiring to and from the switch. Most times if the backup lights do not work this is the root cause.

I didn't find a location for the backup light switch,

But found the following on Autozone.com:

Backup Light Switch Operation:
An open switch that prevents voltage from being applied to the backup lights until the vehicle is put in reverse. Putting the vehicle in reverse closes the contact and applies power to the rear back-up lights. Check under the dash or somewhere near the steering column if you have a column shifter. If the shifter closes or opens the backup light switch mechanically, one should be able to trace the cable and mechanisms that turn a cam that connects to the backup light switch, somehow. May have to disassemble the steering column area to see it.

The back up switch should be installed on your transmission. Contact me in this adress and i will email the instruction to you on PDF file. Good lukc

EMAIL : [email protected]

You do know your backup lights work in conjunction with safety neutral switch/backup switch on transmission right?

That is your problem, the backup switch, it is on the side of the transmission.

have you tried the brake light switch its located on the brake pedal bracket.