Lights go on when brake switch activated (solved)

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Lights go on when brake switch activated (solved)

Postby spookefoote1956 » Fri May 03, 2019 4:26 pm

This is on the cub. Energy Transfer with Boyer EI and Boyer powerbox. An original problem was that the rear light went out when the main beam came on, I cured this with a diode but now when the brake switch is activated the headlight goes on. I've tried being as logical as possible but can't figure out how this is happening. There is a common live but shouldn't be affecting it. :?

Any thoughts gratefully received.

Cheers, Chris
Last edited by spookefoote1956 on Sat May 04, 2019 12:38 pm, edited 1 time in total.
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Re: Lights go on when brake switch activated

Postby Harry44 » Fri May 03, 2019 4:32 pm

In my experience most of these daft faults are a bad earth.

Hope that helps.

Harry
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Re: Lights go on when brake switch activated

Postby Mick D » Fri May 03, 2019 4:46 pm

Give us a clue

Post a photo of your wiring diagram - or are you making it up as you go along?

Regards Mick

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Re: Lights go on when brake switch activated

Postby spookefoote1956 » Fri May 03, 2019 6:30 pm

wiring 1.jpg


wiring 2.jpg


Here we go Mick. The top photo is the lecky basket with Boyer Unit, Powerbox, Coil and central earth. The Brown, Red and Black wires in the middle go to the rear light which in turn are connected Brown to Brown, Red to Yellow in the headlight top row and Black to central earth.

The second image is inside the headlight. The top row of wires is the six core cable from the box with four common earth points to the left and four common lives to the right. The bottom row is earths from horn, light switch and headlight. The Green through to Brown is the wire from the brake switch to rear bulb. The Black in the middle goes off to the horn. The White is the kill switch. The Green through to Yellow is the rear light. The common Reds go feed to the brake switch, horn, headlights.

Hope this helps, thanks Mick

Chris
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हरे कृष्ण हरे कृष्ण
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!

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Re: Lights go on when brake switch activated

Postby spookefoote1956 » Sat May 04, 2019 12:38 pm

Sorted. For some mad reason it was the LED stop tail bulb causing problems. But a real bulb in and hussah!
हरे कृष्ण हरे कृष्ण
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!

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