if the wire to the flasher was cut off, it musta been not working right [maybe stuck?] and someone decided to just skip signaling a number 51 bulb is 6V [actually 7.5, so it'll last longer on 6], so you'll have to find the equivelent in a 12V
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
a 