Dave,
Well, this is what happens when you get to be an old Fa.. like me. I'm incredibly sorry for the misinformation I presented to you. I was dead certain that I'd never seen any Grands with AMBER turn signals. Well, you surely proved me wrong. What an AIRHEAD I AM. What do you expect for a retired fireman? Breathed too much smoke I guess.
Anyway, with all that being said, YES, YOU WILL NEED A TAIL LIGHT CONVERTER AND, THE ONE YOU SHOWED, IS THE CORRECT ONE. And with that, my drawing is DEAD ON, for what you need to do in your Grand in the wiring of the toad lights. It is exactly the part you need. You can purchase those on line at etrailer.com or, The Hitch Source, or multiple other on line agencies.
Or, depending on how well equipped your local RV supplies store or, even a Napa auto parts store might have them. But, one thing here, you have to make sure it's a " Two wire to THREE wire" tail light converter, just like what you pictured.
Many places stock the THREE wire to two wire version and, that is NOT THE ONE YOU NEED. So, be careful in your purchase. Again, sorry for the wrong information.
Scott
