Wasn't sure where to post this so here we go. Recently purchased an 2008 Razor 3110DS toyhauler. Has Onan 5500 generator with only 52 hours. Starts and runs great. Went to turn on my 15 BTU A/c and it only clicks but doesn't come on. Every other appliance does work with the genny. Use 50 amp cord outside and A/c blows nice and cold. Why does A/C not work with generator? LR.