I own a 2005 GT which had a salvage title. imported it to the netherlands and completely rebuild it. For all the exterior lights i installed new assy's and wiring. All was working fine but at the moment the LH rear turn and stop lights do not sequence from inboard to outboard. only the inboard light illuminates. i swopped the harness to the rh side and one time al 3 lights illuminated but after switching of the elec. power and on again only one light illuminats. i have 3 spare harnesses but changing/witching the harnesses does not solve the problem. i meassured the wires all ok. changed the bulbs also OK. in the juncion box installed a new fuse ande also in the box under the hood. is there a sequencing box somewere?
To my knowledge, there is no sequencing box for the tail lights. There are aftermarket kits you can buy and install, however. One kit is a "splice in" affair and the other is a complete wiring harness assembly that you swap out with the OEM harness. You didn't mention if the harnesses you have are OEM or not. I would try to find an OEM harness and see if the lights work correctly, even though they won't sequence.
