back up lites on 1999 Mercedes-Benz ML430

my white back up lites work jsut fine if the shifter is two the left of the revers on the automatic shifter but when the shifter goes to the right where it is supposed to for revers the lites turn off

Asked by for the 1999 Mercedes-Benz ML430
You have a defective reverse light switch, which maybe part of a larger switch which may be expensive. Possibly you can have the switch adjusted. Best of Luck!