Reverse light

Ok then.
There are 5 possibilities. 1)External linkage adjustment, 2)Faulty switch, 3) internal part problem, 4) switch not engaging properly, and 5)loose external lever on on the end of the internal lever pin.(shift fork)
Heres what I would do.I would check in this order:5,2,1,4,3.
- #5; This is the most common problem.If the lever is loose it will require additional pressure on the stick to over-travel at the box to turn on the light.Those levers have to be tight. That means firstly, they have to be tight on the studs. If theyve been run loose, the corners of the stud will be rounded off, and just tightening the nuts wont work for long. You have 3 options; 1)replace the worn parts, 2) repair them, 3) Red loc-tite them 4) weld them. If still no good, go to #2.(might as well check them all).
-#2;Unscrew the switch, stick it back in the socket, have a helper observe the lights while you diddle the pin.If good,go to #1
-#1; I would disconnect the external linkage, while its in reverse. Still no light, go to#4
-#4; Too many washers between the switch and the case.There should be just one thin paper gasket in there. If still no good, go to #3.
-#3; If youve come this far its time to look inside the box. Drain some fluid, and pop the cover off. Put the box in reverse.Eyeball the switch-pin to lever-shoe engagement.Either the switch is too short or the shoe is damaged, or the pin is not popping out far enough.
Ok. Now good luck.
Thanks it's still not working. I did all the above except drain fluid and go inside. Will do that next.