Hello all. I have a 1956 Ford F100 that started having an issue with the headlights. After being on a minute or two they start sporadically flicking off and on. Park lights and dash lights are not effected when this happens, only headlights. I am thinking either the headlight switch or high beam switch is faulty (both stock items). I don't have a spare of either, so before I start throwing parts at it, has anyone else had this issue and can point me in the right direction?