hello just bought this navigator and has many electrical problems but the main one i want to know my reverse lights dont work and on my shifter its in drive but shows 1 on the light

when i put it in reverse my mirrors tilt down so im assuming my car knows its in reverse and the reason my reverse light not working because something else right?

if my transmission sensor wasent working my mirrors wouldn't tilt down right?

 

A common thing you might want to check on is the two Torx bolts under the steering column. They loosen over time and it effects the throw of the shifter.

 

Since you didn't say so I'll have to ask, did you change the bulbs or test for power at their sockets?