My C10 has the reserve lighting module as you described. It is a 1986 model. I would rather have it the way Ted described bit I got to live with what I got. I will look at the diagrams and see if there is a way to defeat this feature.
GP, what Stash say's is true.
My bike is an 03, so I don't have the Reserve Lighting Circuit.
So, that could explain the difference.
But I think I also did the relay addition on my 86 and it worked fine.
But, my memory sux.
Others here will know if they have the relays added to their 86-93 for sure.Ride safe, Ted