Switches
For HT lead click here. All switches are for 7/8″ handlebars but the 31278 dipswitch can be filed to suit 1″ handlebars.
Ignition and Cut-out Switches
The Square Four used a kill switch in the panel on the 4G; the MKI used a combined lighting and ignition switch mounted in the headlamp for 1949, which was moved to the tank panel for 1950; in 1951 separate switches were used, the light switch was in the headlamp and the ignition switch was under the seat, this arrangement continued to the end.
The twins cut-out switch story is complicated and inconclusive. According to the Lucas lists for the KH magneto it was provided with a cut-out in the end cover until 1954; however a handlebar mounted switch is also listed, probably because the replacement magneto did not have the cut-out. The 1954 FH had a clamp on switch and both twins were fitted with a small switch that screwed to a bracket mounted on the left rear handlebar clamp stud.
The singles are easy, they don’t have one, although when we are occasionally asked for one we suggest using the exhaust lifter, come on, we all had to learn once and it is nice that there are some new people appreciating our old bikes.
Part No. | Description | Model | Years |
76204 | Cut-out button, clamp-on (solder wires on) Used when there is no cut out on the mag. | KH | 1948-54 |
76204 | Cut-out button, clamp-on (solder wires on) | FH | 1954 |
76207 | Cut-out button, attaches to bracket 6434-55 on the left rear handlebar clamp stud | KH/FH | 1955-58 |
6434-55 | Bracket for cut-out switch 76207 | KH/FH | 1955-58 |
31276 | Kill switch in panel | 4G | 1937-49 |
34057 | PLC6 lighting and ignition switch, closest available to the original 34080 PLC5 switch | MK I | 1949 |
34055 | PLC6 lighting & ignition switch, Lucas replacement for the original 34075 PLC5 switch | MK I | 1950 |
318341 | Ignition key, fits original and replacement switches | MK I | 1949-50 |
30608 | Ignition switch with tumbler and keys, replaces original | MK I/II | 1951-58 |
54316731 | Tumbler and keys for replacement ignition switches | MK I/II | 1951-58 |
312305 | Key for original ignition switch | MK I/II | 1951-58 |
6180-51 | Ignition switch bracket, hangs from the left side of the side car lug | MK I/II | 1951-58 |
0195 | Stud, ignition switch and oil tank to s/car lug | MK I/II | 1951-58 |
5860-51 | Nut, ignition switch and oil tank to s/car lug (2 per) | MK I/II | 1951-58 |
5860-51Q | 2 Nuts and stud, ignition switch and oil tank to s/car lug, Stainless | MK I/II | 1951-58 |
Lighting Switches
The lighting switch (the one that turns the lights on and off as opposed to the one that dips and un-dips the headlamp) is pretty straight forward. Early ones for use with 3 brush dynamos and the like included a ‘charge’ position. Most that were fitted to W/NGs included a ‘convoy’ position so that only a tail light was visible, as long as the faint red glow in front was kept in sight you were all right, possibly. There are several other variations of this switch but all can be wired to do the same job, ours are supplied with a wiring diagram, I doubt that the Ebayers will supply you with one. A longer knob was fitted in conjunction with the alloy top yoke as it was a bit difficult to operate with the standard short knob. The dip-switches are easy enough until we arrive at 1956 when the horn button that was screwed into a hole in the handlebars in 1955 is still listed in the parts book for 1956 to 1958 as well as a combined dip/horn switch. Lucas parts books only list the dip/horn switch, I have listed both options, but I think that the dip/horn switch wins, as a separate dip switch is not listed anywhere; are you asleep yet?
For combined lighting and ignition switches see ignition switches above.
Part No. | Description | Model | Years |
Light Switches | |||
31340 | Light switch in instrument panel, not correct for W/NG | not 1949-50 SQ4 | 1936-50 |
351567 | Knob & screw for 31 340 light switch, includes W/NG | not 1949-50 SQ4 | 1936-50 |
31371 | Light switch in instrument panel with chrome bezel. Not available | KH | 1950 |
31315 | Light switch in instrument panel on headlamp, long knob | All | 1951-55 |
351724 | Knob & screw for 31 315 light switch | All | 1951-55 |
31340 | Light switch in instrument panel | All | 1956-58 |
351567 | Knob & screw for 31 340 light switch | All | 1956-58 |
308234 | Clip for holding 31,340 and 31315 switches in place | All except 1950 KH | 1936-58 |
523986 | ‘O’ ring for light switch, fits in groove on the underside of 31340 and 31315 | not 1949-50 SQ4 | 1936-58 |
101893 | Screw only, light switch knob | not 1949-50 SQ4 | 1936-58 |
Dip and Dip/horn Switches Not fitted to most military models | |||
31482 | Dip switch | All | 1936-40 |
31278 | Dip switch | All | 1946-54 |
31482 | Dip switch | All | 1955 |
31563A | Dip/horn switch, screws to ‘signet ring’ as original or use 31563B | All | 1956-58 |
31563B | Dip/horn switch, as 31563A but clamp on | All | 1956-58 |
100521 | Screw, switch to ‘signet ring’ (2 per) | All | 1956-58 |
6433-56 | Signet ring for 31563A switch | All | 1956-58 |
380459 | Rubber pad, fits between 31563B switch and handlebars | All | 1956-58 |
ELE-12 | Pattern dip switch (not original type) | ||
ELE-13 | Pattern dip and horn switch (not original type) |
Brake lights were not fitted until 1953 but are a wise addition to any machine on grounds of safety
Part No. | Description | Model | Years |
02-0047 | Nut, stop light switch to plate (2 per) | S/arm | 1954-58 |
02-0047Q | Nut, stop light switch to plate, stainless (2 per) | S/arm | 1954-58 |
317577 | Spring, stop light switch, 3” long | Rig/Plun | 1953-58 |
315543 | Spring, brake light switch, 3 ¾” long | S/arm | 1954-58 |
4997-54 | Plate for stop light switch | S/arm | 1954 |
54033234 | Brake light switch | All | 1953-58 |
5730-54 | Bracket, brake light switch, hangs from left silencer mounting | S/arm | 1954-55 |
97-0916 | Round head screw stop light switch to plate (2 per) | S/arm | 1954-58 |
ELE-16 | Brake light switch, Wipac clamp on universal type | ||
ELE-17 | Brake light switch, miller type, good terminals (has a flat base with 2 holes on 1” centres) |
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