Easy check, disconnect the switch and see if the grips are still getting hot. If they are, you have a short. If they aren't you have a bad switch.
Current Stable: 2014 XC, 2004 VStar 1100, PCX 150, 125 SYM Havana.
Born in the deepest jungles of India, I was raised by a friendly bear, until I was kidnapped by a pack of unruly baboons who taught me the finer points of swing jazz, all the while being stalked by an incompetent python and an evil but mis-understood tiger... Ummm, wait a minute, that's the Jungle book, no I was raised just outside of St. Louis, But...in the deepest jungles of a middle class neighborhood .