Author Topic: bsa c10 switch  (Read 261 times)

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Offline allen brighton

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bsa c10 switch
« on: May 15, 2019, 08:28:51 pm »
hi I need some advice ..I fitted an electrex ignition and charging unit to a c10l and wired accordingly , well after an hour or two it failed [electrex repaired it and upgraded it ] however I came across a c10l genuine harness ---the problem is this I want to re-instate my alternator [4 wire]  but I cannot find a circuit diagramme where it shows the lucas switch  [ it has the lighting and ignition in it ]
I found a good diagramme on the forum but none of the switch terminals are listed, the new switch goes up to double numbers ---can any of you tell me what link wires  and connection numbers I need
please ?  , in case you ask the electrex unit worked fine after a few alterations --but it was difficult for me to turn over fast enough  so I tried to revert to a conventional setup , [wish I hadn't now]
but the conventional setup gives a far better spark at lower turnover speed , I am using a sparkright trigger unit [I adapted a twin spark but had to make my own trigger ring , I used this setup on my square 4 works perfectly

hope you can help

regards

allen

Offline Owen

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Re: bsa c10 switch
« Reply #1 on: May 15, 2019, 09:04:39 pm »
What year is your C10L and what switch are you using.  A picture of the switch (front and back) would help. I thoughtvthe C10L used Wipac switch gear?
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline camman3

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Re: bsa c10 switch
« Reply #2 on: May 15, 2019, 10:36:31 pm »
The four wire alternator will be Wipac, so to avoid confusion it would be best to use Wipac switchgear.
I think the wiring diagram is in service sheets on here, if not I'm sure somebody will post it
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline camman3

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1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline allen brighton

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Re: bsa c10 switch
« Reply #4 on: May 16, 2019, 06:19:34 am »
hi guys

many many thanks for your reply but couldn't read numbers on switch --but when I bought he switch I couldn't find a new wipac  see attatched photos of the new swotch --the configutration is subtly different to the wipac --but I did wire it successfully when I had the electrex unit
many thanks in anticipation

regards

allen

Offline Owen

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Re: bsa c10 switch
« Reply #5 on: May 16, 2019, 06:36:12 am »
I can't see a switch only the headlight wiring?
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline allen brighton

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Re: bsa c10 switch
« Reply #6 on: May 16, 2019, 06:53:02 am »
oh ok

I`ll resend , cant get used to modern technology --only just got a phone without a lead it appears that I am only able to send one at a time , if you need the other one please let us know I`ve found via dragon fly a linking list if this helps ----2-12------6-18-----8-11-----10-12-----14-19--------16-17

regards

allen

Offline allen brighton

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Re: bsa c10 switch
« Reply #7 on: May 16, 2019, 06:57:04 am »
2nd picture

Offline Owen

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Re: bsa c10 switch
« Reply #8 on: May 16, 2019, 01:15:13 pm »
That looks like a Lucas PRS8 switch used on the c12. There is plenty of info about fitting that switch. Don't forget the links on the switch.
https://bsac10c11c12.co.uk/smf/wiring-diagrams-91/lucas-1956-c12-(ohv)-wiring-diagram/msg100155/#msg100155
« Last Edit: May 16, 2019, 01:18:23 pm by Owen »
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline allen brighton

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Re: bsa c10 switch
« Reply #9 on: May 16, 2019, 04:56:19 pm »
hi chaps

many many  thanks for the circuit diagramme --I do appreciate the effort -but I have the 4 wire alternator ---but I can progress now until I can work out  the fourth wire [c12 = 3wire]

regards

allen

Offline camman3

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Re: bsa c10 switch
« Reply #10 on: May 16, 2019, 06:26:16 pm »
Connect the yellow and green together to create "centre tap" and it will be a three wire alternator with the white being the low output and the orange the high, then you can wire it as per prs8 and c12 diagram.
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline ianinglis

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Re: bsa c10 switch
« Reply #11 on: May 16, 2019, 08:07:24 pm »
you are making things difficult for your self by trying to fit a lucas switch to a wipac electrical system
why not buy the correct one??
they do come up on ebay every now and then



ian
BSA C10L 1956 - JFO 588
BSA C10L 1954 - MVE 107
RM6 RALEIGH RUNABOUT
ENFIELD DIESEL KUBOTA OC 95
BSA M21 RIGID RKN 816
CBF 1000
BSA ARIEL 3

Offline allen brighton

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Re: bsa c10 switch
« Reply #12 on: May 16, 2019, 08:32:27 pm »
many thanks chaps ---,  I will soon be registering my bike ---you have all been so helpful once again

kind regards

allen