Lucas Windtone horns. How do the electrics go back together?

[Matt]

Edit: Sorted now, thanks MikeR.

 

I've had a pair of old Lucas Windtone horns around that I'm not going to use so I want to clean them up and sell them. I bought one of them as spares or repairs so I started stripping them down to rebuild them. I promptly forgot what order the parts go back together in. Smart*.  If anyone has any knowledge or has a spare one they could disassemble and note the order so I can get mine back together I would be very grateful.

 

I have one that is stamped 5 58 which I'm guessing means May 1958 which is working. The non-working one isn't stamped and by the looks of I would be inclined to say that it is later. These reference photos are with the opening down on the bench.

 

DSC_9212 by Matt S, on Flickr

 

DSC_9210 by Matt S, on Flickr

 

3 and 4 in this photo clearly go on last but the rest I'm not sure about. I assume that 6 and 10 connect to 1 and 2 somehow. One of them I guess connects to 7 (top half of the point) and the other must find it's way to 1 which would bring it through the resistor to 2 (and the bottom half of the point)

DSC_9213 by Matt S, on Flickr

[Bren]

Do what Lucas do - just keep messing with it until it works.

[Matt]

Do what Lucas do - just keep messing with it until it works.

 

I did until it tried to weld itself to the spare battery I was using...

[MikeR]

http://www.uq.edu.au/_School_Science_Lessons/32.5.9.1.GIF

 

I think this gives a good idea of what the setup might be

 

8 and 9 might just be guards for the armature 7 to stop it flexing too much , the main contact is on the top of the horn on top of the adjusting nut , so when the coil is energised the contacts are pushed open by the push rod on the coil , the resistor forms a damping circuit by putting a partial short across the coil so the coil does not return too fast and close the contacts early , probably lowers the tone as well as protecting the contacts from spark erosion.  .

 

somat like this ? 

 

 

hope it works  , going to destroy some brain cells in the Liverpool pubs now ....

[martc]

The problem is by opening it up you've let all the magic smoke out.

[Matt]

http://www.uq.edu.au/_School_Science_Lessons/32.5.9.1.GIF

 

I think this gives a good idea of what the setup might be

 

8 and 9 might just be guards for the armature 7 to stop it flexing too much , the main contact is on the top of the horn on top of the adjusting nut , so when the coil is energised the contacts are pushed open by the push rod on the coil , the resistor forms a damping circuit by putting a partial short across the coil so the coil does not return too fast and close the contacts early , probably lowers the tone as well as protecting the contacts from spark erosion.  .

 

somat like this ?  Image.jpg

 

 

hope it works  , going to destroy some brain cells in the Liverpool pubs now ....

 

Well you put those brain cells to good use first. I had to swap around a couple of the insulators to allow either the positive or the negative coming in to sit down into the little cutouts in the (mid-century) plastic (alternative) but other than that you got it bang on.

 

I'll be sure to do a little video tomorrow. These suckers aren't quiet! Don't make 'em like they used to etc etc.

[Matt]

As promised. Quick and dirty but you get the idea. I didn't want to hold them on because neighbors and because much loud. The echo carries way further than the two-tone Volvo 850 Mixo TR99's I have on the Swift.