The top two taillight blinkers are not working, ALL of the other lights are fine ( rev., brake, and running lights) even the rear lower lights are fine. also checked the wire harness under the radiator resivor and seemed to be fine. any suggestions?

 

Turn on the ignition, turn on your lights, on the instrument cowel there will be a backwards facing fog light button, press it, go to the back of the truck.
Those are called the rear fog lights, all European cars have them, they are so you dont get slammed in the *** while driving in dense fog.

 

It is my top blinkers (left right signals)that are not working, every other light works fine. The fog switch just lit up the lower lights.

 

The turn signal fuse has no power, yet your front turn signals are working? Something seems wrong with the testing procedure. This may be obvious, but have you testes the bulbs, or checked to see if the bulb socket is getting power?

 

I stand corrected the fuse that was tested was for the fog lights. I have tested the socket, it was a no go.

 

arent the blinkers on the rear bumper of the truck? the tops are only brake lights on a 02 disco 03 and 04 blinkers are on the top

 

I dont believe so there is three bulbs in the taillight. could it be a ground?

 

Point noted. I haven't had my RDA of coffee yet. On a 2002 the upper lights from top to bottom are tail, brake, reverse. Turn signals are going to be in the bumper.

and there should be 4 bulbs in the upper lamp.

 

Alright then problem solved, easy enough . thank you its been driving me crazy trying to get them to work. haha.