where do you live that they won't disable DRL? i know canada requires it. another free option. reading through the DRL thread, this is what Rando (our in house T4R electrician) wrote. apparently you can disable the DRL by cutting or disconnecting the green/red wire:
How to disable DRLs
BTW, I just confirmed the following solution to disable DRLs.
1) Pull the relay/fuse block to gain access to the DRL flasher
2) Disconnect the 12 pin connector (D2) from the flasher.
3) Disengage the secondary locking device / terminal retainer on D2. You have to pry it up (but don't remove it) with a sharp pointed tool.
4) Release and remove the green wire with red strip (pin 12 in the corner). You need to use a sharp pointed tool to release the primary retainer clip while you're pulling gently on the wire from the back side. It comes out easily if you have the retainers properly released.
5) Tape off the wire you pulled in step 4. Reattach D2 to the flasher and test.
6) Reassemble everything. Your done! The procedure is reversible and/or you can install a switch betewen the harness and flasher pin 12 to enable/disable the automatic DRL function.
For the hard core guys that don't mind cutting their factory harness, you can simplify this procedure. Just cut the green/red wire. You're done.
I've performed and tested this modifcation and believe it to work. But still, you do it at your own risk. I take no responsibility for anything that happens to you or your truck if you try this.
Enjoy!