Brake LIght Driver Side Stopped Working

I have checked the fuse, tried a new one, that didnt work.
I checked the bulb, tried a new one, that didnt work either.
Not sure what to check next.
All the lights work except for the left brake light. The running light part of that light works, but doesnt get brighter like the others when brake is pressed.

Anyone had this problem or have any sugesstions?

2004 jeep liberty
2 wheel drive
3.7 gas

Use a multimeter to see if there is power on the pin that provides power to that pin on the bulb plug. If you have power there then plug it in, and with the bulb out see if you have power on the metal piece where the bulb makes contact. Use a brick or something to hold down the brake pedal so that the other one lights up, that way you know it should be lit.

Check the female end of that too. Mine somehow got water into it and caused that issue. I had to cut off that pigtail and wire in a new one from a junkyard unit.