My hand warmers don't work on sled after a couple days of riding. Once sled dries out in garage they work again. Is there a connection I should be putting dielectric grease on?
Check with an OHM meter. There is connections under the foam riser clamp cover. Trace the wires to the connection. Depends on year of XM for resistance. 13's had lower than the 14's. You might have a short in then.