you probably got a bad switch on it,try checking for power at the lights when their on high beam if there's no power then the switch is out,it can also be a bad relay ,but on those the switches caused more problems than relays did,the light in the dash can also be burned out causing it not to work,you can also check at he connection point at where the wires come out of the switch to verify there's no power coming from the switch,that will also make the light in the dash not come on,good luck.