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

317577

Spring, stop light switch, 3” long Rig/Plun 1953-58

315543

Spring, brake light switch, 3 ¾” long S/arm 1954-58

54033234

Brake light switch All 1953-58

5730-54

Bracket, brake light switch, hangs from left silencer mounting S/arm 1954-55

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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