So my 03 Sport recently decided to have a major electrical melt down.

These items do not work:

1. Power windows (all)
2. Rear Gate (no power at all)
3. Parking Lights (all)
4. Dash lights (illumination)
5. Constant 12 v power to parking light on trailer pig tail


What I have tried for each:
1. Fuses - (all, multiple times, visual and ohm/power check); window lock out switch , swapped relays
2. Fuses (all), getting power to ECU, swapped relays, unplugged battery and ECU for 10 min.
3. checked bulbs and fuses
4. checked fuses
5. Traced power (black/green wire) from pig tail all the way to source, constant 12 v throughout...


I know the rear gate ecu and lock mechanism can go on these vehicles. However, with the other issue described above I'm not convinced this is the problem. I found out about the trailer parking light issue when I hooked my trailer up and melted the wire on the trailer.

I'm at a loss on where to go from here... Thoughts?

 

Have you checked your alternator ?

 

the master switch on driver door if bad will affect all windows.
the headlight switch would kill the parking lights and trailer lights. however a faulty trailer wire harness would affect that as well

 

You sure you have traced back all the wiring? Sounds like you may have cooked one (or more) during a dead short. seems like you would have discovered it with the fuses, though. Time and effort my friend. Good luck.