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Hi. Can anyone help I'm rewiring my 1959 dominator 88 and need to know which lighting/ignition switch to use. The headlight shell I have has two holes that makes me think it has separate light and ignition switches ? It's coil ignition 12v. Any help appreciated 
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The bike would most likely have had a distributor and coil . Which would have used the PSR8 switch . But could now be  changed . A few photos of headlight unit and ignition source would help us . 
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One hole will be for the ammeter and the other for the lighting and ignition switch.  Some also had a smaller third hole for a Lucas badge.  The ignition key was a small item that entered the switch from above with a solitary prong that kept the key in place when the ignition was turned on.  Of course the original would have been 6V but all sorts of mods were made in the intervening periods.  The 6V magneto models have a far smaller and simpler switch, the 41SA,  whilst the 12V magneto and twin coil systems used the 88SA.   Have fun, Howard
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Well said Howard. A 6v (or 12V) magneto machine, would have had a simple on off switch for the lights. While a 59-88 coil ignition should have had a PRS8.The fine details of which are on my web site under info sheets. That is assuming you have a PRS8, in place, bear in mind that the Ignition key with these is a basic flat tab BUT often something similar gets used, even the odd small screw driver!! Either of the options fouls up the thin metal tab that holds in the original Lucas type key. Bear in mind that the PRS8 fits into a 19mm D shaped hole, so what ever switch you fit, it would be a good idea that it is/was the right one for the headlamp.
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My 1962 650SS would have originally been 6V with magneto, but was12V when it came to me. It had the 41SA light switch in a 19mm D-hole in the headlamp shell and no ignition switch. Having recently changed to electronic ignition with coil for improved starting, I needed to incorporate an ignition switch in the system. The PRS8 fits into the original 19mm D-hole and provides an combined lighting and ignition switch whilst looking fairly original.
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Hello again Alistair - You could always copy the factory and fit a separate Lucas ignition switch on a small bracket afixed to the frame just between the tooltray and frame-top-tube, above the oil tank. The 12v twin coil 650SS, Atlas and 650 Mercury models all used this feature.  I think the switch itself came fro a car. It was held onto the short bracket with a large chrome-plated nut that screwed against the bracket on to the switch.  It has a FS type ignition key ( bit of a shame really because the steering lock key was an EJR type - so one key won't crack it ) . Good luck, howard  
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This switch might have been used on a car, but I am pretty sure it was the 2 position Ignition switch as use on the early Commando as well a Lucas one. But on the 650SS and Atlas the position of the switch on its 'make do' bracket always seemed a bit 'make do'. The rear of the switch was accessible and hence could be prone to being 'fiddled with. On my Featherbeds I managed to fit up a panel across between the oil tank and the battery box, where some Fbeds had a feed hole to the air cleaner. By putting my ignition key in here it made the rear of the ignition switch 'very inaccessible!! IE when I had a wiring issue I had to remove the tool tray every time. Also you could stall the bike and then forget to turn the ignition off, so a tell tale on head lamp/instrument bracket was needed. THEN you could also fit the 4 position later Commando ignition switch in this place (between oil tank/battery box) but of course that would put you light switch well away from the handle bar!

 


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