If your high beam indicator works, then I'd make sure the grounds at the headlight buckets themselves are good. Also check for voltage at the buckets on the black and red wires at the headlights, which is high and low beam voltage from the foot dimmer switch. There should also be voltage at the H terminal (yellow wire that feeds the foot dimmer) of the headlight switch when the switch is on. Missing voltage at any of those points will tell you there is a break (broken wire, bad switch) before that point.