i don't have a clue what car you are working on so i'm shooting in the dark based on my 69 RR. my car did not come with that light package but i loved it in my first RR many, many moons ago. i added it this car from who knows what out of a junk yard 30 some years ago. i didn't mess with the connectors when i took it out and i'm pretty sure the yellow wire had a bullet connector.

anyway, you said you found your timer relay at a dealership?? care to share that part number? i'd like to get a spare.