A300 First Officer inadvertently placed annunciator light switch to the test position prior to takeoff; but no test sequence occurs. Cruising at FL330 all indicator lights in the cockpit suddenly illuminate; accompanied by several ECAM fault messages. The crew elected to divert and discovered the incorrect switch position passing 10000 FT.

Narrative

Prior to departure; the Captain asked me to put the annunciator light switch in the bright position; which I did. The three position switch has dim; bright; and test. The test position tests all of the lights in the cockpit. Cruising at FL330; suddenly; all of the switch and indicator lights in the cockpit illuminated. The ECAM announced 'NAV ADC; CAPT VSI fault; F/O VSI fault.' Nothing in the QRH or AOM (Aircraft Operating Manual) covers this. We took an inventory of what was available. The engines were running; the ND only showed compass rose with heading bug; the autopilot was engaged; the FMC worked normally; etc. Since the radio frequency selectors and ILS selector are LEDs; they all showed 8's. The Center frequency had limited coverage; so we backed up communications with 121.5. We declared an emergency and asked for vectors to ZZZ; since it had a 13;000 foot runway. In the current condition we didn't have down and locked indications on the gear; so we wanted a long runway in case we had issues with configuration. Descending through approximately 10;000; the Captain noticed that the annunciator light switch was in the test position. The switch was moved to the bright position and all indications returned to normal. The landing was uneventful.