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Re: 1969 Triumph Bonneville Tail Light Ground [Re: Stuart] #671197
10/16/16 5:21 pm
10/16/16 5:21 pm
Joined: Sep 2013
Posts: 1,641
Pacific northwest
Q
quinten Online content
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quinten  Online Content
BritBike Forum member
Q
Joined: Sep 2013
Posts: 1,641
Pacific northwest

The ET igniton has 2 distinct and separate power supplies ,
Originating from seperate stator coils ,
feeding
the 2 separate filaments in the taillight bulb .

They then share a single common earth path .

If the taillight lights
And the brake light does not ,

It is not the original common fender/frame earth path ... or the wire you added
... that is/was at fault .

Look for the problem in
1. The power supply (stator coils )
2. The wiring
3. Bulb holder
Or
4. The brake switch

To test the stator ,Jumper a wire from the stator wire
directly to the brake filiment .
If that works , the problem lies somewhere in between .

.

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Re: 1969 Triumph Bonneville Tail Light Ground [Re: quinten] #671216
10/16/16 8:13 pm
10/16/16 8:13 pm
Joined: Jun 2002
Posts: 9,469
Scotland
S
Stuart Online content
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Stuart  Online Content
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S
Joined: Jun 2002
Posts: 9,469
Scotland
Hi Quinten,

Originally Posted By quinten
The ET igniton has 2 distinct and separate power supplies
They then share a single common earth path

Up to now, I have deliberately avoided mentioning "earth" (or 'ground'), because a) Rick is a relative newbie and b) ET electrics are AC so there isn't any "earth" (no DC distinct 'supply' and 'return').

Moreover, if there really were "2 distinct and separate power supplies", the ignition would only work when the brake pedal was depressed, so the lamp was on ...

So well done for clarifying that ... facepalm

Originally Posted By quinten
If the taillight lights
And the brake light does not ,
It is not the original common fender/frame
path
... that is/was at fault

Mmmm ... especially when the brake filament draws three times as much power as the tail filament and we have no idea of the condition of the bike and the components that make up the "fender/frame path" ...

Regards,

Page 2 of 2 1 2

Moderated by  Alan_nc 


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