| Also known as | 35835T, 46-15410 |
| Diagram | Fig. 31 — IGNITION CAPACITOR AND T100C HEADLAMP · ref 6 |
| Subsystem | electrical |
| Listed in parts books | 1968, 1970, 1973 |
Kill-button, type 151 SA
Lucas type 151SA kill button, a normally-closed two-wire push switch for cutting the ignition at the handlebar.
This is the Lucas type 151SA kill button, part number 35835, a two-wire push switch that mounts in a small housing on the handlebar and lets the rider cut the ignition circuit without reaching for the key. It shows up in the catalog under the ignition capacitor and headlamp figures for the T100C and TR6C, so it's wired in alongside those components on the bikes that carry it.
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The button works by interrupting the circuit when pressed rather than grounding it, which is why it's called out as normally closed. That distinction matters if you're pairing it with a modern ignition system rather than the original points setup, since a grounding-type switch won't do the same job.
The legacy alias 35835T and the number 46-15410 both point back to this same physical switch, and our records show it was later carried forward under the 35835T designation. If you're chasing this part from an older parts book listing, any of these numbers should get you to the right switch.
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