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Bushman Pastoral headlamp wiring
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mikef
Chatham Kent
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February 7, 2020 - 6:35 pm
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Hi All.
      I was looking at the previous post about wiring a headlamp switch and started looking at the wiring diagrams that I have.
Just by accident I started looking at the Bushman Pastoral diagram.
I think there is a mistake in the Bushman diagram, I cannot see how the headlamp could ever work like that.
If it is a mistake then it's in all of the Bushman Pastoral diagrams that I have D10, D14 and B175.
Does anyone agree, the error is on the headlamp switch.
I guess no practical value in my findings, just thought it was interesting.
Diagram below.

Untitled.jpg

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Blue Heeler
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February 7, 2020 - 7:25 pm
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Dark red, power from lighting coil to main switch. Illustration shows inside bare base of switch, as you`d look at it if you removed the top & sliding contacts, springs etc , yes?

Horn & speedo bulb take their power from the switch, same post, black wires.

Dark blue wire goes off to the dip switch.

What have you spotted Mike...what have I missed?

Blue

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mikef
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February 7, 2020 - 8:05 pm
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Hi Blue.
    If you look at the headlamp switch, you will see the dark red wire that supplies the AC power is connected to pin 7 of the lighting switch.
There is no way that I can see that this will ever connect to the rear light/speedo light at pin 2 or headlight at pin1.
Maybe I have missed something, can anyone put me out of my misery. I won't sleep tonight !!

Mike.

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Blue Heeler
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February 7, 2020 - 8:15 pm
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Mike, that`s what the sliding contacts are for...those little brass bits that you move by turning the switch 🙂

Don`t worry, wiring ain`t my hottest subject and illustrations often don`t match the real thing with great accuracy.

You can now sleep well tonight 😉

Blue

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stubaker58
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February 7, 2020 - 8:22 pm
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Does the diagram show the view from underneath the switch (and does it make any difference?)

D7/14 hybrid (4 speed with D7 crank etc.) on the road, D10 Bushman awaiting rebuilding.

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mikef
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February 7, 2020 - 8:26 pm
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Hi Blue.
     Yes, the contacts will slide but only so far.
Pin 7 will only make contact with pin 8 or 6 whichever way the switch is turned and those pins go nowhere.
I think links are missing.
Mike.

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Blue Heeler
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February 7, 2020 - 8:30 pm
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mikef said
Hi Blue.
     Yes, the contacts will slide but only so far.
Pin 7 will only make contact with pin 8 or 6 whichever way the switch is turned and those pins go nowhere.
I think links are missing.
Mike.  

Ah well, maybe you have a point Mike, I`ve not had one to bits recently...but maybe it has a "bridged" contact piece, they can have several moving contacts, half moon shaped...

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Blue Heeler
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February 7, 2020 - 8:31 pm
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stubaker58 said
Does the diagram show the view from underneath the switch (and does it make any difference?)  

I`m tempted to dig a switch out and have a look...but not tonight

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mikef
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February 7, 2020 - 8:32 pm
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Hi Stu.
  The view is the underside of the switch(looking at the pins). Pin 10 is the missing pin on the switch. Pin 10 and 2 are internally connected in the switch.
Mike.

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mike p5xbx
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February 7, 2020 - 11:00 pm
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Mike
as you know all the switches are the same moving between two poles with 3 isolated contacts + the link between 2 and 10
but the wiring harness and more importantly the harness sockets are different
add a link between pins 3 and 6 on the socket and have another look

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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mikef
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February 8, 2020 - 6:46 am
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Thanks Mike.
A missing link, strange that no one at BSA ever noticed as the same error was reproduced in the D10,  D14 and B175 manual.
Mike.

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Sponge
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February 8, 2020 - 8:14 pm
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I don't think its an error. I have got one of those switches and a genuine BSA wiring loom / 5 wire alternator and it all works fine.

Sponge 

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sunny
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February 9, 2020 - 2:00 pm
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im   with you  Sponge      nor  do   i    

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mikef
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February 9, 2020 - 3:08 pm
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I am sure the looms are wired correctly, it's just that the wiring diagram has the links missing.

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NeilB
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February 9, 2020 - 3:31 pm
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Wiring diagrams don't usually show switched "links", is it not just the fact it's confusing to look at the "empty" switch while trying to figure it out? Just a thought 

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sunny
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February 10, 2020 - 9:22 am
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wy   woud  thay   make   thins   ezy  for   joe  pulic     thers  moor  than  dyagrams    ,,, superinpozed     photos  also

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Blue Heeler
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February 10, 2020 - 9:52 am
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Rethink.

As Stubaber58 suggests, this is an illustration showing the bottom of the switch.

Look at the tri-legged dotted lines, representing the switch internal movable contact, surely? I was hoping to dig out a switch to confirm, but not had the time yet.

Turn that dotted shape clockwise, looking from the other side as you would if you were turning the switch on as per normal...and what happens...and as you point out Mike in post 9, there`s also that internal connection, banana-shaped in bold.

Power is therefore connected to speedo bulb, horn and dipswitch. All`s good, yes?

Although wiring is not my top subject, like the tortoise, I do get there in the end....can I be excused now to go and lay down in a darkened room?

Blue 

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mikef
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February 10, 2020 - 3:50 pm
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Hi Blue.
    Hope you're now fully recovered.
The tri legged dotted lines don't conduct, only the ends connect pins together. So with the switch turned anti clockwise when viewed from underneath, you'll only get a connection from pin 7 to pin 8. Pin 8 is shown as going nowhere.
If you turn the switch clockwise viewed from underneath then pin 7 will connect to pin 6, which also goes nowhere.
The simple answer is they have just missed a couple of links out, I think. I wish I'd kept my thoughts to myself.
I need to lie down now !!
Mike.

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