Took to the next level
Following these great instructions I replaced the bulbs in my window switches and then climate controls. During long trips I would have to "dim" down the backlighting because the surface of the switches got hot enough that I was afraid the plastic might melt. I've seen it happen in a few late 1990's Grand Cherokees.
You can see in the pictures below that I powered the LEDs using the orange wire with the grey stripe (it's smaller in diameter than the rest of the wires in both harnesses, I think it's a 22). That allows the LEDs to dim with the rest of the Jeep's back lighting. I ordered 10 LEDs from mentioned website and I had them four days later. I used the warm white color and they worked great.
Here are some pictures of what I did:
I removed the old light bulbs/housings and used little pieces of electrical tape to cover up the old contacts. I installed the LEDs in the exact area where each bulb was removed. As you can see from the "final project" picture that I should have put an extra LED in the lower left and right corner areas. Aside from that they provide better light coverage than the stock bulbs. All buttons and switches still work perfectly. They dim with the rest of the interior lighting as I wanted them to work. When I need to go in there again, I'll install a few more LEDs to have complete back lighting coverage.
I also disassembled the locker/e-disco switch panel. I didn't find any normal light bulbs in their so I left them alone and re-installed it the way it was. I have pictures of it too if anyone is interested in what the internals look like.
-Matt