I used to have Gerbings heated gloves so am familiar with the Gerbings connections. Mine was a direct connect to a fuse block.
No heated grips on the bike yet, but as it already has a Gerbing pick up installed, was thinking about heated gloves or liners in the meantime and curious about what controller you were using with your set up?
And also, excuse my ignorance on that, how to route the Y-Harness to the gloves? Is it to be fed inside the jacket and down the sleeves or to be externally connected directly to the gloves? Cannot quite picture something very clean for that.