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d7 lighting
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mickh
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June 22, 2015 - 6:33 pm
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hi  all, got d7 1963/64,runs great .first kick. but the bulbs keep blowing when engine starts when you switch the light on to main lights .brake light not affected  .twin switch on head light, any ideas ,where  to start, and what to check  first ,battery ok, many thanks mickh

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nickjaxe
Runcorn Cheshire UK
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June 22, 2015 - 6:55 pm
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Have you put a volt meter across the batt to see what volts the geni is putting out.

Does it have the old basic rectifier or a newer type regulator/rectifier.

Nick.

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mickh
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June 28, 2015 - 3:34 pm
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hi nick ,got 6v across the terminals old type rectifier,i think is the light switch itself, been codged up ,will try and look out,for used one,thats my first job, I will then go through the rest off the wireing as and when i,v replaced the switch,theres no power coming from the switch to the head light when the bike is running,same as the rear light no power to the tail light,my son in law is a electrition, its baffled him, mick h

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nickjaxe
Runcorn Cheshire UK
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June 28, 2015 - 3:37 pm
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You maybe getting voltage spikes though...not sure how a duff switch could blow a bulb.

You owned the bike long...has it only just started doing this??

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sunny
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June 28, 2015 - 4:24 pm
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hi  mik   you  need   to  I/D  wich  batery   systoms   on  your  d7      and  if its   as  it  left  the   bsa  factory    ,,,,   the  britsh  batery  systom   for   d7   is  not   the  same   as the  d1,3&5   bantams           ,,,,how many  switches   &   spec  number  on  the  geny  ,,,,it  may  have   changed   over   time  any  way      ,,,get  the   rit wiering   dyagram  to  help  ,,,

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mickh
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June 28, 2015 - 8:16 pm
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hi ,got the bike 9 months as a non runner, been standing some time ,good clean ,its come up ok, lights where not working, battery was flat, cleaned carb plug, points,starts first kick, model 63-64 d7 twin switch, no lights nothing,not even when running,notice the bulb when I started to sort out the wiring ,mags ok ,rectifier is ok,all been checked,from the ignition switch to the light switch there is power after that no power to lights,so I presume light switch, I am going to replace the l/switch and dip and horn switch, where will I get a good used one from any ideas can any body recommend a trusted dealer, i,v noticed in the spares manual you have to buy the complete wiring harness is that right,mickh

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sunny
Norfolk
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June 28, 2015 - 8:55 pm
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hi mike   the  headlamp  on  batery d7  modles   donot   lite   up  unles  the  motor  is  runing        as   wiered   at  the  factory  ,,,,,,,,,,,,,,,,     the  spec number  on  the geny  for a 2 switch  d7     spec  1704     if  its  been  changed  the  wiering  has to change  to  suit that  diferant  generater  ...  theres   4  moor   that  fit  in place  of the  1704   spec geny  all 4  have diferant wiering....  so  you  need  to  know   wot  spec   geny  you  have     and  if  itself   is  wiered  correctly    ,,,,,,

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Sprung Chicken
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June 28, 2015 - 9:38 pm
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To add to what Sunny has said, the spec No. is on the rim of the generator.. Behind the brake pedal in the pic below.2012_06040008.JPG

I will add that you won't be able to use lights when the ignition switch is in the 'emergency' position, that is the switch turned so that the E is facing forwards. Incidentally, you should not run the bike in this position for very long.

Before buying a new harness, I would check again that there is power getting through to the pink wire that runs between the light switch and the dip switch with the bike running and light switch on H ( turn switch to the right).

 

D7ds.gif

Here's the wiring diagram....

sp_PlupAttachments Attachments

Dougie;Glasgow ;Scotland.
1955 D1, 1970 B175

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mickh
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July 8, 2015 - 4:56 pm
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hi doug, there is power at the pink cable,mag is spec no 1704,serial no364, the light switch as been taken apart some time and bodged up with paper around the terminals ,I think this is the problem, I cannot go any further until I change the switch on the loom can you buy the bottom half of the switch,if not I will look for used item,thank you all for the info you have gave, mickh

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Doug Brown
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July 9, 2015 - 6:19 pm
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nickjaxe said
You maybe getting voltage spikes though...not sure how a duff switch could blow a bulb.

You owned the bike long...has it only just started doing this??

The a/c out put from the genny is perfectly balanced by the load, if you switch out the load but keep generation it will spike when it remakes via the switch.

** Please log in to view ** Your bike should have a ducon switch that makes before it breaks so the genny is never dis connected from the load.

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nickjaxe
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July 9, 2015 - 9:54 pm
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that make sense...

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flintdog
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July 9, 2015 - 10:25 pm
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i have some switches spere

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Unitminor
Norfolk
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October 15, 2021 - 6:38 pm
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A quick check try swapping the 2 sockets round ie ign to light switch and vice versa . As the switches can be interchanged it would prove if you have a faulty switch .

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Stoo63
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October 15, 2021 - 9:42 pm
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Hopefully in the intervening 6 years, they've sorted the switches.

'49 LE; '50 D1 Lucas; '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting; '60 5TA; '62 BSA Sunbeam; '72 Mobylette; '76 FS1-E; 

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