The way I told you is correct, the older sleds that came with factory hot grips were wired differently, old sleds with aftermarket grips were wired as this one, the looping of the system is done in the harness on later sleds, this particular sled has the seperate wires for the thumb warmer but they are hooked together in the harness, Lasse just hook it up as we spoke and it will work.
If you look at later sleds with seperate controls for the thumb and the grips, they have a seperate circuit for each.