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#712088 - 10/21/17 4:47 am BSA Hornet (ET) lighting wiring diagram ****  
Joined: Aug 2012
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Dana_twin Online confused
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Dana_twin  Online Confused
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Oregon
I can't find a wiring diagram for the lighting of a '65 BSA Hornet (ET ignition no battery) but assume the brown/green wire is connected to the brown? That's the key question but a wiring diagram would be nice... can;t find one anywhere..

Last edited by Dana_twin; 10/21/17 4:48 am.
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#712089 - 10/21/17 4:51 am Re: BSA Hornet (ET) lighting wiring diagram [Re: Dana_twin]  
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Boomer Online content
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Orygone
Maybe because they didn't have lights?


Bill B...


Boomer
#712091 - 10/21/17 5:09 am Re: BSA Hornet (ET) lighting wiring diagram [Re: Dana_twin]  
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Dana_twin Online confused
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Oregon
The Hornet harness as standard with the 47197 stator (from the factory) supported the wiring kit but yeah the bike as standard did not come with the kit of course. I've got an old ad for the lighting kit somewhere, back in the day it was less than thirty smackaroonies. bet that will get a "rise". Also by the way the bike that sold on eBay appeared to have the original type lighting kit with the Bates headlamp and limp sausage tail lamp although someone goobered the H/L bracket

#712093 - 10/21/17 5:38 am Re: BSA Hornet (ET) lighting wiring diagram [Re: Dana_twin]  
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quinten Online content
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quinten  Online Content
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Pacific northwest

the wiring OF lights depends on the stator.
some run the stop light filament off the brown wire (a center tap of the ignition coils)
and the head light and horn off the brown wire with blue stripe. (lighting coil)

https://www.britishonly.com/pdf/Lucas/LucasServicemanual_noSB519_part8.pdf

scroll to last image/page of pdf. for theoretical generic ET/ AC with lights diagram

.

#712097 - 10/21/17 7:11 am Re: BSA Hornet (ET) lighting wiring diagram [Re: Dana_twin]  
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Dana_twin Online confused
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Dana_twin  Online Confused
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Oregon
Yes I have that same drawing in the service manual. this has the stock 47197 stator with brown/blue for H/L and brown for T/L. I'll just get out the DVM to confirm brown/green is connected to brown. In that case brown is for the stop lamp and brown/green for the tail lamp I'll assume. Thanks

#712101 - 10/21/17 7:46 am Re: BSA Hornet (ET) lighting wiring diagram [Re: Dana_twin]  
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Stuart Online content
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Stuart  Online Content
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Hi,

Originally Posted by Dana_twin
Yes I have that same drawing in the service manual. this has the stock 47197 stator with brown/blue for H/L and brown for T/L. I'll just get out the DVM to confirm brown/green is connected to brown.

Uh-uh; that isn't what the diagram shows.

The diagram shows:-

. Brown from the stator is connected through the (foot brake lever) stop lamp switch only to Brown in the tail lamp - that's the brighter brake filament in the bulb.

. Brown/Green in the tail lamp connected to the same side of the "Lighting Switch" as the headlamp dipswitch, the Lighting Switch being supplied by the Brown/Blue from the stator; Brown/Green in the tail lamp is connected to the dimmer tail filament in the bulb.

If you connect tail lamp Brown/Green to the Brown wire, both filaments in the bulb will only illuminate when you press the foot brake lever ... cool

Btw, if you haven't discovered it already, the diagrammed connections to the cross-hatched bar (labelled "Frame Of Machine" in the previous diagram) don't actually work very well (worse the more-careful and higher-quality the cycle-parts restoration facepalm ). Rather than half-arsed scraping off paint or powder-coating, if you run (Red?) wires from all the components to a central bolt and also attach the Red wire from the stator, the electrics will be more 'reliable'.

Hth.

Regards,

#712154 - 10/21/17 8:53 pm Re: BSA Hornet (ET) lighting wiring diagram [Re: Dana_twin]  
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Dana_twin Online confused
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Oregon
Yes brown/green via the brown blue of the headlamp switch... thanks. Tah for the clarification. Next question is the black/ brown... assume that's for the horn? Agree getting a good earth on these is always a challenge. thanks again

#712208 - 10/22/17 8:50 am Re: BSA Hornet (ET) lighting wiring diagram [Re: Dana_twin]  
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Stuart Online content
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Scotland
Hi,

Originally Posted by Dana_twin
black/ brown... assume that's for the horn?

Well, strictly-speaking, "Brown/Black" (insulation mainly Brown with one or two Black tracer lines), that's the standard Lucas pre-'71 colour combo. between horn and handlebar button. Risking stating the obvious, the horn must be insulated from its mounting bracket, as it's pressing the horn button that completes the circuit.

Hth.

Regards,

#713214 - 10/30/17 3:44 pm Re: BSA Hornet (ET) lighting wiring diagram [Re: Dana_twin]  
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Gary E Offline
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Medford, Oregon
With ET ignition, the brightness of the lights will be very disappointing.


1967 BSA Wasp
1967 BSA Hornet (West Coast Model)
1967 BSA Hornet (East Coast Model)
1968 BSA Firebird Scrambler
1968 BSA Spitfire Mark IV
#714845 - 11/13/17 12:27 am Re: BSA Hornet (ET) lighting wiring diagram [Re: Dana_twin]  
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Roadwarrior Offline
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El Dorado, California
Not if you go fast enough. Dull glow at stop lights, and real bright at speed.


Bob


73 Triumph T140 Main Ride
70 Bonnie
67 BSA West Coast Hornet

56 Chevy

Who are the brain police?



#714859 - 11/13/17 9:21 am Re: BSA Hornet (ET) lighting wiring diagram [Re: Gary E]  
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Spitfire Ken Online content
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Illinois
I WAS JUST WONDERING IF LED BULBS WOULD WORK BETTER AT IDLE THAN STANDARD BULBS SINCE THEY REQUIRE LESS CURRENT !!!!!!!!!!!!!!!!!!!!!!

Last edited by Spitfire Ken; 11/13/17 9:22 am.

The Devil is in the details.

1957 BSA A10 Spitfire Scrambler (number matching, very correct in decent condition)
1965 BSA A65 Lightning Rocket "Clubman" (restored)
1966 BSA A65 Spitfire MK-II (restored)
2001 Kawasaki W650
#714882 - 11/13/17 5:24 pm Re: BSA Hornet (ET) lighting wiring diagram [Re: Spitfire Ken]  
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quinten Online content
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Pacific northwest
Originally Posted by Spitfire Ken
I WAS JUST WONDERING IF LED BULBS WOULD WORK BETTER AT IDLE THAN STANDARD BULBS SINCE THEY REQUIRE LESS CURRENT !!!!!!!!!!!!!!!!!!!!!!

yes
Leds could work well.
the lighting coils are separate.
and provide what, ? something like 25 or 30 watts at 6 volts AC... at 3000 rpms?
the devil is in the details.

LEDs are diodes, so only pass power in One Direction.
stock LED vehicle bulbs are almost always wired for DC. ... with a polarity.
wired in strings that function positive or negative .. so pick your poison.
...there are also a few Universal LEDs, that are polarity-neutral and have internal circuitry
to 'rectify' wiring for either positive or negative.

to run a dc LED bulb.
the lighting circuit would need to be rectified and a 6 volt zener added.... or a 6 volt rec/reg added.
then the lighting is run 6v led DC, without a battery, or maybe with a capacitor

or

a custom LED string could be wired directly to AC
with half the string positive, the other half negative. .. the length of the diode string
would determine its voltage drop and some amount of resistor added
and then, ac voltage spikes at high RPMs may need to be addressed with a pair of clipper diodes
to keep voltage in an LED friendly range.

or, a universal DC -LED, containing its own internal rectifier. .. may work directly off the AC stator

and no, I haven't tried any of this.

.

.


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