Author Topic: 1930 BTH Head Lamp Question  (Read 1451 times)

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Offline douglas1947

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1930 BTH Head Lamp Question
« on: 09 Jan 2020 at 16:20 »
I restore a 1930 Douglas H3 with original BTH electric, and have to renew it.

Im not shure about the main bulb socket. This socket in the center( for 2 wire bulb) is fixed by an unusual clamp. This bulb was connected to a dip switch on the handle bar.
Is someone common to the BTH Lamp switch to help?

But I think the main bulb was a single wire bulb and the "dim" light was switched on the headlamp switch(the 2nd bulb on top of the unit).

I will try to send a photo.

Thanks
Michael

Offline douglas1947

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Re: 1930 BTH Head Lamp Question
« Reply #1 on: 09 Jan 2020 at 16:22 »
Extra photo of the lamp.

Offline richard s1

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Re: 1930 BTH Head Lamp Question
« Reply #2 on: 21 Jan 2020 at 19:59 »
Hello Michael

The bulbs and sockets look correct and in excellent condition.  There should be a dipswitch and a twin filament bulb which should ideally be a
 6v 12/12w, and the pilot and rear light bulbs 6v 3w.  The wattage is so low because the BTH dynamo kicks out a very small amount of power.

On my T6 I used a 6v 36/36w bulb and that gave me about an hours light before the battery went flat, but the light was at least  reasonable. With the 12/12w bulb the current was balanced, but the beam hardly went beyond the front wheel. A candle in a jam jar wouldn't have been much worse!!
 
What you have got looks very original.

Cheers   Richard

Offline douglas1947

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Re: 1930 BTH Head Lamp Question
« Reply #3 on: 22 Jan 2020 at 14:36 »
Hello Richard,

thanks for your informations.
next I have to find out the right connection for the wires   on the switch, because I have to do a new wire harness.
The dim beam has a direct wire from the switch, but I have not found the point for the wire to feed the dip switch.

Michael

Offline Douggy29

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Re: 1930 BTH Head Lamp Question
« Reply #4 on: 14 Jun 2021 at 06:39 »
I recently acquired this project S5.It came with a BTH headlamp which I panel beated and got looking fairly good , however the question has come up and I can find very little information about. It has no reflector and upon speculating about this I'm now thinking the body is the reflector. Am i correct in this? Can anybody help me out please.

Offline richard s1

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Re: 1930 BTH Head Lamp Question
« Reply #5 on: 16 Jun 2021 at 09:31 »
The BTH headlamp body is not the reflector.    The reflector needed fits into the rim after the glass as on most other makes.

Richard

Offline Douggy29

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Re: 1930 BTH Head Lamp Question
« Reply #6 on: 17 Jun 2021 at 05:43 »
Thanks very much for your reply Richard. I don't suppose you have a diagram or a picture of one do you?
 Many Thanks

Offline Daren W Australia

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Re: 1930 BTH Head Lamp Question
« Reply #7 on: 17 Jun 2021 at 07:10 »
Hi this is all I have Ta Daren
too many dougli not enough time!

Offline Daren W Australia

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Re: 1930 BTH Head Lamp Question
« Reply #8 on: 17 Jun 2021 at 09:22 »
More
too many dougli not enough time!

Offline Douggy29

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Re: 1930 BTH Head Lamp Question
« Reply #9 on: 17 Jun 2021 at 09:34 »
Thanks for that Darren. Where are you in Australia? I really need to see the reflector, a picture or a diagram

 

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