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IGNITION SWITCH QUESTION #57919
11/10/07 11:17 pm
11/10/07 11:17 pm
Joined: Jun 2007
Posts: 138
Essex,England.
rebelpaul Offline OP
BritBike Forum member
rebelpaul  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 138
Essex,England.
Hi guys,I wonder if any of you can help with a ignition switch wiring problem I have? I'm rebuilding a BSA A65,and sometime ago during the early days of the rebuild I bought a new aftermarket ignition switch(there was no wiring diagram with the switch as I remember and the A65 is not in original spec anyway).The switch is a standard off/on type and has 4 wires coming from it,a black/white,a green one ,a red one and a plain black one,can anyone identify these wires so I know which ones to hook up to what! I.E which is live and earth etc.Cheers,Paul.


78 TRIUMPH T140v BONNEVILLE
52 TRIUMPH 6T THUNDERBIRD (custom)
64/65 BSA A65 ROCKET (trike)
68 BSA B25 FLEETSTAR
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Re: IGNITION SWITCH QUESTION #57920
11/10/07 11:34 pm
11/10/07 11:34 pm
Joined: Feb 2004
Posts: 1,956
Flint,Mich
norbsa48503 Offline
BritBike Forum member
norbsa48503  Offline
BritBike Forum member

Joined: Feb 2004
Posts: 1,956
Flint,Mich
Power goes in power comes out, that and a meter should get you working. Now a clever bloke will come on with the terminal #'s and the color codes as per original but does the re-pop have terminal #'s on the back? So that that will help? You still need a meter. The electrons don't care and you need the knowledge.


norbsa
1960 TR6
1963 Super Rocket
1965 650 Star
1966 441
1968 Thunderbolt
1969 Twinkle 250
1972 Fastback
1974 Roadster
1970 S.S
Way too many BSA's not named
http://decentcycles.com
Re: IGNITION SWITCH QUESTION #57921
11/10/07 11:59 pm
11/10/07 11:59 pm
Joined: Jun 2007
Posts: 138
Essex,England.
rebelpaul Offline OP
BritBike Forum member
rebelpaul  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 138
Essex,England.
Hi norbsa,thanks for replying,there are no terminals on the switch just the coloured wires.Unfortunately I don't possess a meter,I'm hoping (albeit naively) that the wires would have a known particular colour for in/out etc.I think the red wire maybe the live in and the plain black wire maybe the earth wire,that being the case what are the green and black/white wires for!


78 TRIUMPH T140v BONNEVILLE
52 TRIUMPH 6T THUNDERBIRD (custom)
64/65 BSA A65 ROCKET (trike)
68 BSA B25 FLEETSTAR
Re: IGNITION SWITCH QUESTION #57922
11/11/07 12:17 am
11/11/07 12:17 am
Joined: Oct 2004
Posts: 466
Beautiful North Carolina
HughdeMann Offline
BritBike Forum member
HughdeMann  Offline
BritBike Forum member

Joined: Oct 2004
Posts: 466
Beautiful North Carolina
You need a charged battery, a marker light bulb(one filament), a pencil or pen and a piece of paper. Turn the switch on, connect one wire to the positive battery terminal. Hold the bulb shell on the negative terminal, and touch each remaining wire, in turn, to the center terminal of the bulb. When the bulb lights, those two wires are connected in that switch position. Make a note of every wire connection in every switch position. Then the wiring can be figured.
I'd expect something like red to battery, black to ignition, green to pilot, black/white to headlight. Since this is a "universal" switch, all the wires may not be needed. Whatever, this is the first step.


Hugh: Proof the Dodo is not extinct
1964 Bonneville
A couple others
Re: IGNITION SWITCH QUESTION #57923
11/11/07 12:41 am
11/11/07 12:41 am
Joined: Jun 2007
Posts: 138
Essex,England.
rebelpaul Offline OP
BritBike Forum member
rebelpaul  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 138
Essex,England.
Thanks Hugh,That helps me a lot.I'll try that tomorrow.When I've watched people using a meter I'm totally confused by it and never understand how it works.


78 TRIUMPH T140v BONNEVILLE
52 TRIUMPH 6T THUNDERBIRD (custom)
64/65 BSA A65 ROCKET (trike)
68 BSA B25 FLEETSTAR
Re: IGNITION SWITCH QUESTION #57924
11/11/07 11:57 pm
11/11/07 11:57 pm
Joined: Aug 2001
Posts: 4,591
Owego, NY, USA
Mark Z Offline
BritBike Forum member
Mark Z  Offline
BritBike Forum member

Joined: Aug 2001
Posts: 4,591
Owego, NY, USA
Internally, the switch has only two terminals, and it makes no difference to the switch which is which. Some of the wires coming out of the switch are undoubtedly connected to each other, either two and two or three and one. This can be determined with a continuity tester or an ohmmeter. Just see which wires have continuity to each other when the switch is in the off position.

My wiring diagram for (pre-1971) A65 shows one wire going to the power side of the switch, a brown/white wire that goes to the zener diode.

The diagram shows two or three wires coming off the other side of the switch, depending on whether or not you have an oil pressure warning light. The three wires would be: White for the oil pressure warning light, white to one of the coils, and brown/white to the lighting switch.

This would tend to imply that one of the four wires on the switch is intended for the "in", or power side, and the other three are intended for the "out" side, but check this first with your continuity tester.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: IGNITION SWITCH QUESTION #57925
11/14/07 4:02 am
11/14/07 4:02 am
Joined: Feb 2007
Posts: 61
dfw tx
kevy republic of Texas Offline
BritBike Forum
kevy republic of Texas  Offline
BritBike Forum

Joined: Feb 2007
Posts: 61
dfw tx
you can get a meter for about 10 dollars at harbor freight it does come with instructions as i recall. I just ordered a universal ingnitiond switch from JC whitney for about 10 doallars also that has the wiring diagram with it. along with the univeras coil that got my t100 c going.


if all else fails read the directions.
Re: IGNITION SWITCH QUESTION #57926
11/16/07 8:27 pm
11/16/07 8:27 pm
Joined: Jun 2007
Posts: 138
Essex,England.
rebelpaul Offline OP
BritBike Forum member
rebelpaul  Offline OP
BritBike Forum member

Joined: Jun 2007
Posts: 138
Essex,England.
Kevy,The ignition switch you bought that has the wiring diagram,is it the type with spade ends or wires like mine.My switch has 4 wires coming from it,a black/white wire,a red wire,a green wire and a plain black wire,if yours is like this maybe you would be kind enough to post the wiring lay-out for me.Cheers,Paul.


78 TRIUMPH T140v BONNEVILLE
52 TRIUMPH 6T THUNDERBIRD (custom)
64/65 BSA A65 ROCKET (trike)
68 BSA B25 FLEETSTAR
Re: IGNITION SWITCH QUESTION #57927
11/18/07 1:40 am
11/18/07 1:40 am
Joined: Apr 2006
Posts: 874
Manchester, Connecticut, USA
Tom D. 67 Bonny Offline
BritBike Forum member
Tom D. 67 Bonny  Offline
BritBike Forum member

Joined: Apr 2006
Posts: 874
Manchester, Connecticut, USA
You can buy a continuity tester with a battery and a light bulbfor about $3-5 at any auto parts shop.Just figure out which is the input or common lead, and then you can do whatever you care to with the 3 output leads. Try to do this sober, makes it much easier pint


Tom D. 1967 T120R Bonneville
Anyone know of a place that sells Loctite
by the quart?

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