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brian



Joined: 22 Aug 2011
Posts: 2491
Location: QLD, Australia

PostPosted: Sun May 20, 2018 12:17 am    Post subject: Reply with quote

Bad earth!
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Current rides - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250,
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GeeKay



Joined: 29 May 2009
Posts: 1523
Location: West Yorkshire

PostPosted: Sun May 20, 2018 9:20 am    Post subject: Reply with quote

brian wrote:
Bad earth!


but the earth to the bulb holder is OK for the tail lamp to function OK - it earth's to the bulb body - so the stop lamp should work too.
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Bimota SB6 and SB6R road bikes.
Project bikes:- Suzuki V4 500, TS185 rural cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica (with a difference).
Too many projects...............
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brian



Joined: 22 Aug 2011
Posts: 2491
Location: QLD, Australia

PostPosted: Sun May 20, 2018 12:44 pm    Post subject: Reply with quote

GeeKay wrote:
brian wrote:
Bad earth!


but the earth to the bulb holder is OK for the tail lamp to function OK - it earth's to the bulb body - so the stop lamp should work too.


Electrics can be fickle things. Hard without looking at it. The symptoms in your original post point to bad earth to me. I'd double check the tail unit earth all the way back. Check all the connections and earth points on the frame etc too
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Current rides - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250,
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Evilchicken0



Joined: 12 May 2010
Posts: 2735
Location: London

PostPosted: Sun May 20, 2018 11:35 pm    Post subject: Reply with quote

Is the bulb in the right way round.
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GeeKay



Joined: 29 May 2009
Posts: 1523
Location: West Yorkshire

PostPosted: Mon May 21, 2018 10:21 am    Post subject: Reply with quote

Evilchicken0 wrote:
Is the bulb in the right way round.


offset pins so only fits one way.
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Bimota SB6 and SB6R road bikes.
Project bikes:- Suzuki V4 500, TS185 rural cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica (with a difference).
Too many projects...............
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2bims



Joined: 03 Apr 2010
Posts: 5219

PostPosted: Mon May 21, 2018 10:31 am    Post subject: Reply with quote

Is your head on the right way around???..... Laughing

But seriously...before you removed the loom and spliced and cut and remade...did either of the front or rear brake switches work?
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Admin
Site Admin


Joined: 22 Oct 2007
Posts: 491
Location: Stafford, UK

PostPosted: Mon May 21, 2018 10:59 am    Post subject: Reply with quote

Hi

While the bulb holder only holds a bulb one one (well, without more force than advisable!), the spade connectors on the back can go on either way.

The brake light bulb draws ~4 times the current of the tail light bulb.

I would be tempted to run a supplementary earth to the rear light to see if that changes things.

As an aside, you are getting 11.36v at the tail light. What is the voltage over the battery?

All the best

Katy
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Evilchicken0



Joined: 12 May 2010
Posts: 2735
Location: London

PostPosted: Mon May 21, 2018 1:56 pm    Post subject: Reply with quote

Admin wrote:
Hi

While the bulb holder only holds a bulb one one (well, without more force than advisable!), the spade connectors on the back can go on either way.

The brake light bulb draws ~4 times the current of the tail light bulb.

I would be tempted to run a supplementary earth to the rear light to see if that changes things.

As an aside, you are getting 11.36v at the tail light. What is the voltage over the battery?

All the best Katy

That was going to be my second point, rig a temporary earth from the the bolt holding the rubber generator cover to the lamp and see how that affects things
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Jonny B Bad



Joined: 05 Dec 2009
Posts: 380
Location: NE London

PostPosted: Mon May 21, 2018 4:20 pm    Post subject: 6R rear light Reply with quote

Check that the wires going into the ignition switch have not been chafed.
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GeeKay



Joined: 29 May 2009
Posts: 1523
Location: West Yorkshire

PostPosted: Tue May 22, 2018 2:10 pm    Post subject: Reply with quote

so, as suggested, I ran a temporary earth straight from the battery earth terminal,so.......................



and connected it direct to the tail lamp unit. Tested with side lamp wire - both filaments could be illuminated - tried with wire from brake switches - nothing - zilch.
I then connected another "jumper" wire to the live feed (red wire) to the rear brake switch and connected it to the stop lamp filament of the bulb, with the original (loom) earth wire attached, and it illuminated. So to me, the problem lies with the feed to the switches.
Next step is to jury-rig a live feed, direct from the battery, to the rear brake switch and see if that works.
All this for a bloody MOT - grrrrrrrrrrrrrrrrrrrr Evil or Very Mad
_________________
Bimota SB6 and SB6R road bikes.
Project bikes:- Suzuki V4 500, TS185 rural cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica (with a difference).
Too many projects...............
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2bims



Joined: 03 Apr 2010
Posts: 5219

PostPosted: Tue May 22, 2018 5:41 pm    Post subject: Reply with quote

GeeKay wrote:
All this for a bloody MOT - grrrrrrrrrrrrrrrrrrrr Evil or Very Mad


Sounds like you need a New MOT garage to get your bikes tested.....The most rigorous check I receive is whether I've brought biscuits to go with his coffee.....Although a functioning brake light is quite a nice "addition" to a motobike
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Evilchicken0



Joined: 12 May 2010
Posts: 2735
Location: London

PostPosted: Tue May 22, 2018 5:56 pm    Post subject: Reply with quote

GeeKay wrote:

All this for a bloody MOT - grrrrrrrrrrrrrrrrrrrr Evil or Very Mad


Cheer up - my Six has roughly the same problem except the rear indicators don't work either. At least you didn't blow the main fuse Wink
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Admin
Site Admin


Joined: 22 Oct 2007
Posts: 491
Location: Stafford, UK

PostPosted: Tue May 22, 2018 6:24 pm    Post subject: Reply with quote

Hiya

Silly question I know, but do you have a wiring diagram you can post?

All the best

Katy
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GeeKay



Joined: 29 May 2009
Posts: 1523
Location: West Yorkshire

PostPosted: Tue May 22, 2018 8:44 pm    Post subject: Reply with quote

Ta Da.............................!



Very Happy
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Bimota SB6 and SB6R road bikes.
Project bikes:- Suzuki V4 500, TS185 rural cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica (with a difference).
Too many projects...............
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GeeKay



Joined: 29 May 2009
Posts: 1523
Location: West Yorkshire

PostPosted: Tue May 22, 2018 8:46 pm    Post subject: Reply with quote

Admin wrote:
Hiya

Silly question I know, but do you have a wiring diagram you can post?

All the best

Katy


No I haven't, Katy.
_________________
Bimota SB6 and SB6R road bikes.
Project bikes:- Suzuki V4 500, TS185 rural cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica (with a difference).
Too many projects...............
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