I have an older bottle generator and a headlamp/taillamp.

The tail lamp has no bulb; the headlamp has a bulb and works great.

My question being what is the typical voltage for forward/aft lights when run off a generator? I tried putting a 2.2v in the tail lamp, but in this configuration neither lamp would light.

Does a tail lamp use an even lower voltage bulb? Or is the generator to blame?

Thanks,

philip