Started messing with the flasher for the hazards and turn signals today.
The 2003 and newer TJ's use a all solid state flasher that is not all that easy to modify for led lights.
I don't like the idea of resistors or other tricks to get the current back to the level where the flasher works normally.
In my other TJ I have a LED flasher that works the turn signals bit blows the fuse with the hazards.
The other day I was messing with one of our delivery trucks that uses a LED flasher for commercial trucks, that looked like a nice unit for my TJ, so after checking the wiring diagram I decided that it just might work, so gave it a try today and after a few blown fuses I found the correct slots in the flasher socket and it now has regular flashing turn signals and hazards, the only drawback if any is that the turn signals work without the ignition on. It's still jerry rigged, but this is where it's going to go on both Jeeps, it has a nice and pretty loud audible signal on it also, so even with the Jeep completely open you can hear when the turn signals are on while going down the road.
The flasher is made by the Trucklite company
I did the flasher mod with the pre 2003 flasher and yes it killed the battery. These we use at work so far on over 40 trucks or so I have changed one in the last 10 years. It's still hooked up so we will know in a couple of days. Found a trucklite part number for a 5 pin led flasher, just do not know if it will do the same thing as the led flasher I have in my yellow Jeep I might actually on that one bend one of the pins for ignition hot and see if that stops the short in it.
Buttoned it up today and it works like a charm the part number is97232 for a electronic flasher with audible alarm from trucklite, no need to cut or splice any wires, just ziptie or mount the flasher near the steering column, ground the ground wire eyelet and stick 2 spades in the flasher sockets and be happy. Also while going through the trucklite parts book I found a 5 pin led flasher part# 97283, not sure if that does blow the multi function switch fuse when using the hazards though, I know my other Jeep does that with a led flasher I got from Napa, I guess when I have some time I'll crossreference the part numbers