| Also known as | WW10122L |
| Diagram | Fig. 31 — IGNITION CAPACITOR AND T100C HEADLAMP · ref 22 |
| Listed in parts books | Not catalogued by year yet |
| Also fits (as replacement) | 1968, 1970, 1973–1974 · for 34419, 35710 |
SWITCH,3 POSITION LUCAS
Genuine Lucas 3-position toggle switch, PN 31788, an electrical switch that supersedes older Lucas numbers 34419 and 35710.
This is a genuine Lucas 3-position toggle switch, part number 31788. It's an electrical switch, the kind used to control headlight settings on British bikes of this era, and it carries the Lucas name and diagonal-device markings that go with original electrical gear from that period. The older factory numbers 34419 and 35710 are earlier versions of this same physical part, so if your parts book lists one of those, this is the part that replaced it.
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We don't have catalog appearance history on file for this one beyond the number itself and its aliases, so we can't point to specific model years from our own records. It shows up under the legacy form WW10122L in some parts listings, which is worth knowing if you're cross-checking an old parts book against a modern order.
Give us a call or drop a note before you order if you want to confirm this is the right switch for your particular bike and wiring setup — toggle and rocker-style Lucas switches from this period aren't always interchangeable across models, and we'd rather get you the right one the first time.
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