Who knows about electronics and components.
Printed From: rsvr.net Forums
Category: RSV / RSVR / FACTORY
Forum Name: Technical Chat
Forum Description: Any technical problems or useful advise for other owners, remember this is just advice posted here, if you make something go BANG in a big way don't take anyone to court about it.
URL: http://www.rsvr.net/forum_posts.asp?TID=12340
Printed Date: 27 Mar 2026 at 03:42
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com
Topic: Who knows about electronics and components.
Posted By: Throbbing-Twin
Subject: Who knows about electronics and components.
Date Posted: 27 Jan 2014 at 13:45
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After some help from an electronics wizard. Problem I have is very simple and I know how to solve it but need to know what component I need to buy. Started sorting problems on my recently purchased RSV and have found the rear light assembly has been replaced with an LED one at some point. Problem I have noticed is that when activating the brake light switch the brake lights and small front light both come on. Have traced fault to the rear led light as follows. When power is put to the brake light power goes through the light and pcb and makes the normal rear light contact live. This makes the front light come on as power travels through to the circuit. Have done basic electronics and know I can get a resistor or diode or component to place in the wiring so the power will only travel one way. Want to add a component in to the wire that's causing the problem but need somebody to tell me what the part is called that I need at what it should be rated at. Links would be perfect or just tell me what's its called as brains gone rusty since I went to college many moons ago lol. Cheers.  ------------- If its not broken then fix it until it is |
Replies:
Posted By: pjroth72
Date Posted: 27 Jan 2014 at 14:14
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Sorry i don't know the answer,but cant you give maplins a shout pal & explain what you need to do ,they may know what part you need .just a thought
------------- www.apriliaperformance.co.uk www.apriliaforum.co.uk www.apriliaownersclub.co.uk |
Posted By: Spoonz
Date Posted: 27 Jan 2014 at 14:37
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You can block DC with a Capacitor or a diode.
BUT I think you would be trying dodge around the issue rather than fix it. I suspect the lights are wired up wrong. The side light should come on with the tail light but i suspect they have wired the brake light into the same circuit. The Yellow wire should feed the tail light and the Yellow/violet should feed the brake light only. If the new light has differing colours go back to the nearest connector and check there.
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Posted By: redratbike
Date Posted: 27 Jan 2014 at 14:37
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zener diode?
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Posted By: Johnboy
Date Posted: 27 Jan 2014 at 15:07
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Someone did a how to guide on LED indicators using diodes, but it was to stop them back feeding into each side. Like Spoonz says, I think you may have a misplaced wire. Mine are LED rear units, and they are a direct swap. Double check buddy  ------------- 
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Posted By: Throbbing-Twin
Date Posted: 27 Jan 2014 at 15:10
All wiring itself is fine. Its the led light causing the issue due to the fact I think its a cheap cheap version. Had the whole unit out and appart to test it lol. Found 2 extra wires inside and its one of the ones with integrated indicators. Whoever fitted it couldn't have been to smart as the wiring was shocking. Wires twisted together and insulated with clear household Sellotape lol. Gonna get an original rear light soon but bike was neglected by previous owner and needs lots of small bits sorting first. ------------- If its not broken then fix it until it is |
Spoonz wrote:Posted By: Throbbing-Twin
Date Posted: 27 Jan 2014 at 15:11
That sounds familiar lol. Will look around see what I can find. ------------- If its not broken then fix it until it is |
Posted By: Throbbing-Twin
Date Posted: 27 Jan 2014 at 15:13
Definately the light unit. The whole thing looks very cheaply made so prob was built like it. Easy fix but just needed to figure what component I needed. Should have taken pics. ------------- If its not broken then fix it until it is |
Posted By: Spoonz
Date Posted: 27 Jan 2014 at 15:25
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By poor design of light or bodging of the wiring the live feed from the brake circuit is being applied to the parking circuit. Hence the parking light circuit is becoming live when the parking switch is activated. You may not easily see it but i bet the tail light comes on when the brake light is activated as well. On the indicators both circuits are linked via the dash flasher light so they have to be isolated from each other when using led indicators and the load balanced with resistors or a non load reliant relay but not the case with the tail lights. |
Posted By: Throbbing-Twin
Date Posted: 27 Jan 2014 at 16:11
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Was hard to notice but yes the normal rear light also lights up when the brake switches are activated. Dash illumination lights come on also. Had a quick google and still unsure what I need as a Zener diode lets power through both ways or some of them do anyway. Just been for a ride and found another fault I now need to sort lol. ------------- If its not broken then fix it until it is |
Posted By: Spoonz
Date Posted: 27 Jan 2014 at 16:25
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A standard diode will only conduct one way. A zener is just a rated diode as in it will conduct only when a trigger voltage is reached. A Zener is often used as a regulator as it will bleed off excess voltage in a circuit. It would still do the job of blocking DC if you polarise it correctly.
What i don't see is where you are going to apply it in this circumstance. I still think if it were wired correctly it would work fine. I don't think it is a bleed through, just wrongly wired. |
Posted By: Throbbing-Twin
Date Posted: 27 Jan 2014 at 16:49
Spoonz you sound like you know electronics better than me as I'm still confused lol. Here's what I've done so far. Unplug rear light and problem dissapears. Wired up some proper bulbs from a Honda rear light unit I have and all is fine. Wired my LED light to a 12v supply with the blue wire to - and the yellow with green wire to + this makes the brake LED's come on allong with the inter grated number plate light. Moved the + to the solid yellow and normal rear light comes on plus Intergrated plate light. Opened up the unit and removed wiring to rule that out and carried out same tests and got same results. Then I put the blue wire to - and the yellow/green to the + which illuminates the brake light and plate light. Whilst still connected I measured between earth (blue) and yellow and I have 12 volts. Also get 12 volts when applying positive to yellow/green and then test between yellow and earth. My logic tells me if I put a one way diode on the yellow wire then it should stop voltage making the front and dash light coming on when using the breaks. And it will still allow the rear light to function properly. Reason I want to sort it is if I'm slowing down then as I feather or use the breaks then my front side light is winking at oncoming traffic. ------------- If its not broken then fix it until it is |
Posted By: Spoonz
Date Posted: 27 Jan 2014 at 17:39
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You have possibly solved the riddle in your own answer. The common denominator is the plate light.
That should not have any live feed when the brake light comes on it is purely for the lighting circuit. Because it is getting 12v from the brake light supply it is acting as a link between the 2 circuits.
Have a look at the wiring to that plate light. It should only be connected to the tail light feed and nothing else apart from ground.
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Posted By: Throbbing-Twin
Date Posted: 27 Jan 2014 at 18:18
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Will pull it appart again at the weekend. I only done very basic electrics at college. Not good when it comes to component level and pcb fault finding. ------------- If its not broken then fix it until it is |