Rear light shorting - SV650.org

12-10-13, 02:54 PM

Well I finally got round to fitting my tail tidy today...

I tested all the lights and amazingly they all worked.

The problem I've found Is that when indicating, my tail light dims and brightens in sequence to the indicator flash, but only the top 3 bulbs.

If they all did the same thing, I'd be thinking earth fault, but only that top bank!

Any ideas? Or is it a characteristic?

Many thanks

fizzwheel · 12-10-13, 03:26 PM

It would be really handy if you told us what bike you have ?

12-10-13, 04:49 PM

Pointy

fizzwheel · 12-10-13, 04:51 PM

Moved to SV Talk

12-10-13, 05:33 PM

Sorry, still finding my feet
2004 pointy...
original rear light cluster

Thanks

Shawthing · 12-10-13, 06:20 PM

LEDs luminance works on the current passing through them once thier forward bias voltage is reached, hence the resistors limiting the current (controling luminance).
The rear tail light's circuit has top three pairs paralleled separate to bottom 4 pairs.

Presume you checked without engine running , when indicator lamps come on then the battery voltage drops a bit,
and if your battery is low then the differneces in LED Lumiinance will be more noticable.
See what it looks like with engine running.

Shawthing · 12-10-13, 07:06 PM

Also this may help:

http://forums.sv650.org/showthread.php?t=152357

12-10-13, 09:24 PM

Thanks

That other thread was a long, but good read..

13-10-13, 08:18 PM

Generally when lights dim in sequence with indicators it points to a bad earth

13-10-13, 09:54 PM

Quote:

Originally Posted by apchara

Generally when lights dim in sequence with indicators it points to a bad earth

Worth Reading the thread Shawthing posted above
Earth is fine

12-10-13, 02:54 PM	#1
Scoff Guest Posts: n/a	Rear light shorting Well I finally got round to fitting my tail tidy today... I tested all the lights and amazingly they all worked. The problem I've found Is that when indicating, my tail light dims and brightens in sequence to the indicator flash, but only the top 3 bulbs. If they all did the same thing, I'd be thinking earth fault, but only that top bank! Any ideas? Or is it a characteristic? Many thanks

12-10-13, 03:26 PM	#2
fizzwheel Super Moderator Mega Poster Join Date: Dec 2003 Location: Somerset Posts: 3,614	Re: Rear light shorting It would be really handy if you told us what bike you have ? __________________ Look Dave, I can see you're really upset about this. I honestly think you ought to sit down calmly, take a stress pill, and think things over. K5 GSXR 750 Anniversary Edition

12-10-13, 04:49 PM	#3
Scoff Guest Posts: n/a	Re: Rear light shorting Pointy

12-10-13, 04:51 PM	#4
fizzwheel Super Moderator Mega Poster Join Date: Dec 2003 Location: Somerset Posts: 3,614	Re: Rear light shorting Moved to SV Talk __________________ Look Dave, I can see you're really upset about this. I honestly think you ought to sit down calmly, take a stress pill, and think things over. K5 GSXR 750 Anniversary Edition

12-10-13, 05:33 PM	#5
Scoff Guest Posts: n/a	Re: Rear light shorting Sorry, still finding my feet 2004 pointy... original rear light cluster Thanks

12-10-13, 06:20 PM	#6
Shawthing Member Join Date: May 2011 Location: Manchester Posts: 396	Re: Rear light shorting LEDs luminance works on the current passing through them once thier forward bias voltage is reached, hence the resistors limiting the current (controling luminance). The rear tail light's circuit has top three pairs paralleled separate to bottom 4 pairs. Presume you checked without engine running , when indicator lamps come on then the battery voltage drops a bit, and if your battery is low then the differneces in LED Lumiinance will be more noticable. See what it looks like with engine running. __________________ SK9 Sport Black Delkevic can. Non arbores caesa suum mittere nuntius, sed magnum numerum electrons uehementissime incommo. Last edited by Shawthing; 12-10-13 at 06:51 PM.

12-10-13, 07:06 PM	#7
Shawthing Member Join Date: May 2011 Location: Manchester Posts: 396	Re: Rear light shorting Also this may help: http://forums.sv650.org/showthread.php?t=152357 __________________ SK9 Sport Black Delkevic can. Non arbores caesa suum mittere nuntius, sed magnum numerum electrons uehementissime incommo.

12-10-13, 09:24 PM	#8
Scoff Guest Posts: n/a	Re: Rear light shorting Thanks That other thread was a long, but good read..

13-10-13, 08:18 PM	#9
apchara Guest Posts: n/a	Re: Rear light shorting Generally when lights dim in sequence with indicators it points to a bad earth

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