The only really common twin distributor was the one on the Fiat 126.
Cor blimey guvnor, I think we might have a winner! Well spotted that man.
The points drive cam has a single elongated lobe, so when it starts to open one set of breakers the other set is still held open.
At that point the rotor arm is aligned with the correct cylinder.
There is only a single 6V coil fitted, so the distributor points the spark at the correct cylinder.
The points were a bit dirty, but I gave them a careful scrub with fine emery paper and the DMM said they were making good contact.
With the HT lead from the coil held near chassis I was getting big fat sparks, but with the dizzy hooked up and the plugs held against the head I couldn't see much at all. Hence the focus on finding replacement parts for the distributor.
Must admit I was bemused by the complexity of the twin contact breakers *plus* distributor.
I thought the A10 would be a wasted spark system?
Is there any advantage to converting to single fire? Maybe if you fit a hotter cam or something?