hi Jim, a #57 Ba9S mini bayonet bulb should be about 1/4 Amp, and will likely be a bit brighter than it's equivalent 6V counterpart, the #55 if you want a dimmer bulb you could try a #53
when going to 12V, the equivalent bulb are historically listed as: #57 12V 3.4W close enough to #55 6V 2.9W #53 12V 2W close enough to #51 6V 1.5W
6V Ba9S mini bayonet base: cluster and ignition sw. 2 candle power #55 ~2.9W high beam indicator 1 candle power #51 ~1.5W
it's important to use the #51 for the high beam indicator A 55 is a bit too hot for such a small space and the color plastic dot will burn and melt -s
