Both headlamps blew at the same time ?

Ok, installed a headlamp relay harness last year and the lamps have been working great. Left the house before the sun came up yesterday morning, obviously had lights on ! soon as I took off from the light in noticed on the bumper of the car in front of me that my lights went out. turned the switch off then on again and still not lamps, immediately hit the high beams. High beams came on and within a few seconds they went out, now I got nothing but parking lamps. A quick glance at the volt gauge and its reading normal, no overcharge.
Checked the system out today and everything is working fine, minus the lights coming on. High beam indicator still lights up when switch is pressed. All grounds are good, fuses good. Power is getting to both bulbs on both low and high beams. I find it hard to believe both lamps blew at the same time just because. Anybody have any ideas or have had this happen before ?? Both high and low beam circuits have 30A fuses before the relays. Thanks, Erik