Thanks for your help on the wiring. However, what looks like a white wire is actually yellow and I the black wire tracks back to a ground. I also stated that there was a red and black wire on the 41 taillight, it is actually a black and green.

The suburban did have separate bulbs for everything, if I remember correctly. Is there some kind of relay I need to make them work with the one bulb tailights? Can I just splice two of the wires together?

I have very little clue when it comes to wiring.