Removing the gas tank The factory wiring harness for K bikes has a connector for heated grips. It is a "T" connector which has short leads and can be found under the tank on the left side about two thirds of the way back. It has two wires. The green/black wire is switched power from Fuse 1. The brown wire is a ground.
The center wire on the HG switch should be green/black.
I'd recommend not using the low setting for extended periods of time (or at all.) The low circuit has resistive wire under the tank. If you leave the HGs on the low setting long enough that wire has been known to heat up, melt it's insulation and cause shorts and smoke under the tank. I had this happen on my 93 LT. :yow
If you want to disable the low setting to make sure this never happens then cut the orange wire on the back of the switch.