I have checked all of the relevant fuses. The tail running lights, the tail side lights and the liscence lights all dont work. What could this be if it isnt the switch?

If it'* not the switch, it must be in the line between the switch and the bulbs since you said you weren't getting power there. The only other way was if you were only getting partial ground at G402, But all the lights on the back of the car ground there.

Refresh my memory, please: have you got a Driver Information Center on the dash? I guess it could be possible that there'* a bad connection at the control module in the dash, where the separate outputs go out to the different circuits of the car, including those at the back, but I would suggest you start at the back of the car, verify that the brown wiring is actually dead back there, then follow it forward to see where the break is.

In particular, look for damaged or broken connections in the wiring harness in and around the trunk area. Wiring that'* exposed to the elements or junk sliding around in the trunk is a lot more likely to go bad than wiring that'* immobilized and protected inside the car and up under the dash.

Jachin, can you give us an idea of the last few mods you've done? ANYTHING that might have affected this?

Id say the orange wire he cut under thash would be suspect... But he'* sure it was part of an aftermarket alarm.

The only thing i can think of is when i pulled the trunk lid off. i didnt disconnect everything, i just set it on saw horses beside the car, a wire may have been pulled out. But right now the switch seems like the most logical cause, because i tested the brown wire directly at the switch with the lights on and it was registering no power. I also tested the socket for the bulb and it didnt have power.

Did you maybe short a wire, causing the CB internal to the switch to trip?

I'm leaning towards the ground as well. Here'* some info from my diagrams:

Adaptive lamp module:
Pin E - tan/white - runs L & R tail lamps
Pin C - purple - runs L & R tail lamps
Pin D - pink - runs side markers and license plate lamps

G402 - LH rear of luggage compartment, behind wheelhouse.
.....................

As this shows, there are different circuits for all of the lamps that are not working. The brown wire is only the park lamps input (pin M) to the ALM. The only common thing is the ground.

The ALM is VERY difficult to access on a 93. It'* under the steering column above the hushpanel. Good luck.

It took me FOREVER to get a wire in there grounded so my fogs would stay on with my brights.

I think it'* time to shoot out the wires from the switch to each lamp assembly. The Chilton'* schematics have wire colors listed for the exterior lights circuit. I think doing anything else but this would be a waste of time at this point.

Alright, thanx guys ill get to this on my next day off.