Hello - Has anyone been successful in converting current 2000-2005 tail lights to work like the 2006-2007 style where all the lights are lite... Trying to figure out a way to jump the harness and have all 4 lights light up and work as a tail light and brake light.

Thanks,
Jerry..

 

It sounds like this might be what you are looking for:
https://montecarloforum.com/forum/fw...ght-mod-41832/

 

Yep. Change out turn signal socket from a 3156 to a 3157 and trim tab to fit.

Looks like this on my 03 mcss

all parking lights. Top is still turn and bottom is stop.