Date: 14-11-18  Time: 15:21 PM

Author Topic: Rear light  (Read 501 times)

iamthearrison

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Rear light
« on: 06 January 2018, 06:16:14 PM »
A mate at work pointed out yesterday that only 1 of the bulbs in my tail light was on. Having taken them out to check them today, it seems theyre both twin filament bulbs, but, like the headlights, only use 1 filament on either bulb (so the 5w is on on one of them as a tail light, and the 25w comes on on the other when you pull the brakes). Is that normal, and if so, is there a known mod to use both filaments on both bulbs, like there is on the headlight?
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bandit

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Re: Rear light
« Reply #1 on: 06 January 2018, 06:52:25 PM »
Should be 2x Stop/Tail Bulb 12v 21/5w double filament,make sure pins on bulbs are not offset. 


Both bulbs should come on, with lights & the other filaments when brakes applied.   
« Last Edit: 06 January 2018, 07:00:15 PM by bandit »

iamthearrison

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Re: Rear light
« Reply #2 on: 06 January 2018, 07:13:48 PM »
Should be 2x Stop/Tail Bulb 12v 21/5w double filament,make sure pins on bulbs are not offset. 


Both bulbs should come on, with lights & the other filaments when brakes applied.

Theyre both twin filament, but surely that means the pins have to be offset, otherwise how would you differentiate the supply to either filament? And mine come on one at a time (looking from the seat towards the back of the bike, left hand bulb 5w is lit, then goes off and 25w right hand bulb lights up when the brakes are used). Ill have a proper look tomorrow when its light, but neither bulb is blown
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Disorderlypunk

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Re: Rear light
« Reply #3 on: 06 January 2018, 08:16:59 PM »
post cocked up so posted below
(any way to delete this???)
« Last Edit: 06 January 2018, 08:20:39 PM by Disorderlypunk »

Disorderlypunk

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Re: Rear light
« Reply #4 on: 06 January 2018, 08:19:36 PM »
ok just went and looked to make sure and it is as you would expect
2x twin filiment bulbs 21w/5w and
pins are offset which is what makes them go in only one way which means they are hooked to the correct circui
tail lights both bulbs iluminated
brake lights both illuminated
see how the pins are offset


switch the bulbs over first and if it still lights the same then it is a problem with the connections if the problem switches sides then its actually the bulbs


you could just check the bulbs with a multimeter if you have one but if you did then you prob would have already


you might find it easier to take the rear section off so you can clean the contacts cause it is a bit tight in there and its only a few screws and a couple of bolts holding it on give the conections a good clean and maybe a rub with a bit of wet and dry


why have two bulbs you may ask - its actually a safety feature because if you do blow a bulb then you have a backup untill you notice the failure - had to ride 20 miles at night with a lad who had lost his single tail bulb once, didnt know the lad but wanted to keep him protected from upcoming cars till we got him home safely

Jules-C

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Re: Rear light
« Reply #5 on: 06 January 2018, 11:14:14 PM »
Could just be blown brake light filament in one bulb and blown tail light filament in other bulb.  Swap them over and see if brake light now works on other side before going any further. 

Jules-C

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Re: Rear light
« Reply #6 on: 06 January 2018, 11:23:09 PM »
Oops just repeated what Disorderlypunk said.

Disorderlypunk

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Re: Rear light
« Reply #7 on: 06 January 2018, 11:30:36 PM »
i wasnt going to point it out lol

iamthearrison

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Re: Rear light
« Reply #8 on: 07 January 2018, 01:50:11 PM »
Sorted. Looks like the 5w filament has blown in one of them. Looked alright in the dark last night, but multimeter this morning says its not. Thought I had a spare but cant find it, Ill call and get a couple on my way home tomorrow
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