Brake lights flash when indicators flash

[breakz187]

I think this is an earthing issue, but has anyone got any pointer on where the most likely spot is? Where its earthing out? Could it be in the indicator unit itself?

Its a K3 Pointy

[breakz187]

Just ripped the bike apart (nice and oily) and found that its not the loom but the rear brake switch that responsible for the earthing out.when disconnected it works as normal. Will soak in WD40 or replace.

[breakz187]

This was on a k3 pointy btw.

[rotax81]

nice to see someone sorting a problem while talking to themselves :p

[yorkie_chris]

nice to see someone sorting a problem while talking to themselves :p

Actually yeah rather than needing their hand holding! Also adds useful info :)

[breakz187]

Right, its still broken.

Hazards on, brake light flashes, along with number plate light
Indicator on, brake light flashes along with number plate light

Brake light lights up solid, on both front lever and rear pedel/lever

Even when i disconnect the rear brake switch and the front brake switch at least the top 3/4 brake LEDS flash. Only flash a little when the indi is used but more so when the hazards are engaged.

I've ripped the bike to pieces to try an find chaffed wires but cant find the fault. Spent two hours today screwing about. Took the whole back end fairing off to mess with the cables up the sides, tank up, airbox off, obviously the seats off. Played with everything and cant manage to fix it, not even for a few seconds. All wires and looms have been played with so i think it might be a fault with a component. I've been trying with the engine running also and still happens.

Do the rear brake light units fail??
Does the relay near the fuse box ever fail? I assume it has a the flasher unit in there, among other things.
Where are all the earth points on the engine/Frame?
Could it be a low battery, although this behavior still happens when i run the engine at 2-3k rpm

Please help me, before i pour fuel over it and burn it to ****.

[yorkie_chris]

Sounds like bad earth

There are no earths to frame, all in loom.

[keith_d]

It does sound like a duff earth, but it's somewhere back in the loom, possibly a corroded connector on the earth block.

Simplest test is to run a separate wire from the -ve battery terminal to an earth on the light cluster. .

[breakz187]

Where is the earth block you mention? Is it one of the plugs behind the head stock?


Just found this post
http://forums.sv650.org/archive/index.php/t-133075.html

Suggests the brake light cluster can fail on the k3 and k4's. Its a sealed unit so i'll crack it open to see if i can find a problem before i shell out. may be able to fix it and glue it back together....

[G]

My sisters Fiat had this problem, the rear lights were all over the shop exactly as you are describing and it failed its MOT because of it.

In the end I figured out it was a problem with the connectors plugs themselves. Somehow the connector with the pins in it had partially melted internally although it was very hard to notice a difference.

I cut the connectors off the loom and rewired some I got from a scrap yard and the problem was solved.

[Speedy]

Have you got an alarm fitted to your bike?

If so, does it use any lights to flash?

I had something similar on my SV after I 'd cleaned it.......but I can't remember for sure what it was.......think it was something to do with the Hazard switch and the arming of the alarm.

[Miss_Undaztood]

I noticed when I was poking about with my bike ( K4 ) that underneath the left hand rear seat plastics, theres an earth connector block on the outside of the wiring loom. Its basically a load of black or black and white wires coming out of the loom, and go into one side of a connector which is covered with a black rubbery cover. If you pull the cover off, all the terminals are connected with a kinda metal spider, with legs in each terminal, connecting all the wires together. You could prise it out and check it.

That part of my bike was soaking with oil from the fkin scottoiler and I wanted to clean it all, although there may be other ones on the bike for the front end lights etc.

[breakz187]

No alarm.
Had heated grips on but have removed them and the wiring to eliminate this, same with the nautilus horn.

I'll take a look at that earth block you mentioned, as i have a scot oiler that has leaked a fair bit, although i have since degreased the rear storage compartment.

[CB1ROCKET]

I found that the brake light unit to be at fault on mine, swaped for another and its ok.

[breakz187]

weird thing is, i can disconnect the brake light and when i turn ignition on, the pump primes and i can hear that that its whining in time with the indicator/hazards, so i figured it cant be that....also disconnected the rear indicators and the numberplate light, same weird up and down whine from the fuel pump when priming. Surely it cant be those parts at fault????

This is really p|ssing me off now.

Cleaned every single connector on the bike, even those earth blocks with the little multi pin bridge connection. Some were a little dirty, but made fek all difference.

Now killed my battery, so had to buy £20 jump leads to keep on testing off of the car. will order new light and flasher relay from http://www.svspares.com/items/232-3_2583-tail-light.htm

These parts better work but i doubt the light will do anything. I hope its the flasher that farked.

[breakz187]

Just replaced the brake light and the flasher relay. Nothing! Same ****.

I've removed the nose and the dials to get at the only other cables on the bike. Still nothing. Cleaned all connections properly. Cleaned all those weird multi bridged connections.

Im going to put it all back together and get it tested somewhere else and hope it gets through, either that or it fixes itself once i rebuild it all.

BALLBAG!

[Miss_Undaztood]

Hmm, I take it you checked/cleaned the fuses too just incase ? Or, run an earth from the battery and try earthing the lights individually ?
Clutching at straws but what about disconnecting the regulator/rectifier and trying it with just the ign on, but not the engine started ? No idea if the reg/rec can cause weird symptoms like yours or if it would do any damage though, but it still seems like an earth problem to me.

[Miss_Undaztood]

Just been out to the garage to do some stuff and while I was there thought i`d check my rear light when the indicators are on, and, the top 3 sets of LEDS on the tail light flash in time to the indies !!
Oh, c0k ! :(

Although my wiring is drenched in oil yet again, need to get that fkin scottoiler either fixed, moved, or binned.

[breakz187]

tried that - disconnecting the regulator. Disconnected everything i could, even the switch gear, all lights, pulled fuses to limit what was connected. No joy.

[breakz187]

Just been out to the garage to do some stuff and while I was there thought i`d check my rear light when the indicators are on, and, the top 3 sets of LEDS on the tail light flash in time to the indies !!
Oh, c0k ! :(

Although my wiring is drenched in oil yet again, need to get that fkin scottoiler either fixed, moved, or binned.

Oh ****.

Does it do it faintly when the bike is not running, just ignition on, and does it do it slightly more brighter when the hazards are on?

[Miss_Undaztood]

With the ign on but the engine off, the top 3 sets of LED`s are a lot dimmer than the rest, when I switch the indicators on they dull down more but also get brighter in time with the indicator, the difference is even more with the hazards on, the LED`s going from almost off to full brightness in time with the hazards.
With the engine running tho, they brighten up to almost the same as the rest and even with the hazards on they dont pulse much at all. Probably borderline MOT fail.
But, my rear brake switch seems dodgey too as the brake light goes on and off as you add pressure to the foot pedal, as if theres a sticky bit on the switch.
Also, with the hazards on, then turn on the ignition, my fuel pump tone varies in time with the hazards too, but i`m not sure thats a problem.

Dam and blast.

[breakz187]

That is exactly the same as mine, and mines a K3.

Good luck finding the fault, I've spent hours trying to find it.

[timwilky]

look at the loom, I guess it is chaffed and shorting

[Miss_Undaztood]

That is exactly the same as mine, and mines a K3.

Good luck finding the fault, I've spent hours trying to find it.

Are you sure your "new" light is ok ? I assume its a used one from that svspares place which might be duff too.

[Miss_Undaztood]

look at the loom, I guess it is chaffed and shorting

Yeah, i`ll need to take the bike to bits and have a squint at it, the wiring is drenched in oil again which won`t be doing the connections any good.

[Miss_Undaztood]

That is exactly the same as mine, and mines a K3.

Good luck finding the fault, I've spent hours trying to find it.

Just incase you hadn`t realised, i`ve been busy destroying my lights, lol..........
http://forums.sv650.org/showthread.php?t=152357

[barwel1992]

mine does this but only below 3000rpm .....