[horsa]

We're 12-volt with the T-16 but they did originally have a 6-volt coil. A lot of people have smoked them when doing a restoration and trying to go back to the factory design. As Andrew said, he has adopted the late war/post war format of a 12-volt coil on a mounting bracket that stands off the head. Most British T-16s eventually went this way and all of them that survived Swiss service did as well.

So far I haven't had any issue with the divers helmet dizzy. I'd think it would be fairly durable since they stayed on the vehicles into their postwar service life and even the vehicles brought into the USA and converted into cut-down logging mules retained that pattern as opposed to something more modern. Still, it's a bitch to work on once everything is bolted on around the engine.