tailights not coming on when the headlights are on

[man of la manche]

All of the other lights work, turn, hazard, brakes, reverse but the tail lights and license plate lights do not work when I turn on the headlights. Which of the 3 lights in the corner lens are supposed to turn on? (top, middle or bottom) I think I will start with the bulbs and go from there.

 

I also took the bed off to fix the frame and I only put one ground screw back when I replaced the bed on the weekend (behind the driver side lens cover on the bed) could I have missed another ground somewhere?

[Red 1989 MJ]

You can check on the DIY section for the electrical manual, to help you. :smart:

 

If I my memory is right, the ground behind the driver taillight are used for lights and the fuel pump.

 

You could check the connector for corrosion. :dunno:

 

The blue wire is for the night light & the plate light.

[Pete M]

There is a connector in the rear wire harness located right behind the drivers side rear tire. Corrosion inside can cause all sorts of headaches. :(

[man of la manche]

there is no power coming to the blue wire at all, I even tested it up where it comes out of the cab, before I go tearing out my entire cab to trace the wire back can anyone tell me where it connects to the main headlight wire, everything else works just fine back there

 

I suppose I could always just rig it directly to the headlight switch, but I would still need to know whereabouts I can find where the wire to the rear lights starts