Modern Vespa

The kill switch on our 1976 Super was disconnected by a prior owner and we're trying to install a new one.

Can anybody tell us how the kill switch is wired into the ignition switch?

We've been at it for days, blowing fuses and losing patience.

Here's our switch and the wiring diagram.

Thanks in advance!

I'd say #8 and that should be confirmed by checking there is continuity between #8 And #9 when the switch is "off" and no continuity when the switch is on. The question to me is why the PO disconnected. A short perhaps?

Thanks scootermarc69. We'll give it a try. Just checked and yes, there is continuity between #8 and #9 in the OFF position, and no continuity between them in the ON position.

Don't know for sure why it was disconnected. The switch mechanism itself was broken and I'm guessing the wire might have been removed as a precaution to keep it from inadvertently shorting out.

9 (violet) is the contact you need, 8 (black) is the ground connection.

Thanks firekdp, makes sense.

When the ignition switch is "OFF", T9 (violet) and T8 (black/ground) are connected, grounding the spark from the primary ignition coil there in the headset. When it's on, there's no connection between those terminals, so connecting the kill (ground) switch to T9 should allow the spark to be grounded at the handlebar.

As per firekdp. Many thanks.

firekdp is a wizard.

He's helped me on Lammy stuff questions in the past and seems to know all of the dark art of electrickery.