LED indicators flash when bike is revving above idle.

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Hi, So first time poster, been lurking for a while and reading good info on lots of bike topics.

I have installed LED indicators that on the front are also DRL's and on the back are brake and tail lights.

The bike is a Suzuki DR125 SM 2009 model.
I have installed a LED indicator relay and wired it all up and made sure there is low resistance between the negatives of the indicators and negative on the battery terminal (2 Ohm's max)

When the engine is off they work fine and when the engine is at idle they work fine. But when I rev the engine even slightly they flash and do what ever they like.

Road it 200mtrs down the road and they were all over the place.

I wouldn't have fitted LED's if the original incandescent's and brake lights were still on the bike. But sadly I'm tight and bought a cheap 125 that I have "fixed".

Any help would be grand.

Many thanks.
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When in doubt, mumble.

[Nobby the Bastard]

You say 'original leds'. If the original indicators were led you wouldn't need to change the relay.

Have you just bought an indicator relay from halfords and stuck led indtators rather than bulb ones on it?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

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[Nobby the Bastard]

Go and buy a proper relay designed for use with leds.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Robby]

If one of the indicators is misbehaving, it's the indicator.

If they are all misbehaving, it's the relay.

Be ready for added fun if that bike uses AC lighting anywhere.

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[WD Forte]

Just looked at a dr125sm stock wiring diagram and it pretty simple.
All the led indicators going wonky like that suggest you fooked up the wiring by not understanding the system you were trying to modify
and/or the devices you fitted.
Without detailed info on what you have and what you've done
others can only make vague guesses at remedies
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bikers smell of wee

[guffers_hump]

So whoever had the bike before me took off the stock indicators and brake/tail light.

I was left with a non working brake light, no indicators and a bunch of loose wires.

What I have done is worked out which wires are right and left indicators, worked out which wire is brake light and tail light. Then got the negatives for each.

I then checked the continuity between the negatives and they were all under 0.8 of a ohm.

I added/split the brake light and tail light wires into 3 so that I could connect the brake light and tail light parts of the indicators and also wire up this new LED Brake/tail light as well.

I then added/split the side light bulb wires so that I could connect the DRL connection of the indicators to the bike.

I also replaced the side light with an LED bulb, took out the indicator bulb on the clocks and put a Relay that specifies it is for LED indicators.

They lights all work as they should when the ignition is on but when the engine is running it causes specifically the indicator LED's of the LED's to randomly flash, unless I put the brake on then they work as brake lights.

Hope this is more in depth.

Could it be that there is a lot of electrical noise on the indicator wire and would it be worth installing capacitors across the indicator and negative wires to reduce this?
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When in doubt, mumble.

[Robby]

Try disconnecting the DRL bit. I don't have a wiring diagram for this bike to hand, but if the sidelight and headlight use AC, then the LEDs will flicker.

[guffers_hump]

[guffers_hump]

[guffers_hump]

Could it be that my Rectifier is doing a bad job?
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When in doubt, mumble.

[Nobby the Bastard]

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[TaffyTDM]

If you think its electrical noise, wrap a couple of windings of the cable as close to the source of the noise (id say just after the relay on the light side) around a ferrite core and see if that helps. Search ferrite filter on Ebay

[steve the grease]

" unless I put the brake on then they work as brake lights. "

This is not supposed to happen , so it quite likely that something has got connected up wrongly.
Earthing is always a contentious area , Led's which only current in one direction make it even more problematic.
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All the above is my personal opinion, you can see my lips move, but I'm talking out of my arse.
I've been riding, and fixing , bikes for 50 years, in that time the more I learn, the less I am absolutely sure of.....

[iooi]

[sickpup]

Seem to be lots of people not understanding what is going on here. The OP knows exacty how what he has is supposed to work.

The front LEDs have two circuits. There is a DRL circuit and an indocator circuit and the two circuits share a common earth.

The Rear LEDS have three circuits. There is an indicator circuit, a DRL circuit and a brake light circuit which share a common earth.

On the front the Black wire is the negative, the yellow wire is the indicator live and the white wire the DRL live.

Ont he rear the black wire again is the negative, the yellow is the indicator live, the blue is the DRL live and the red is the brake light live.

For now just connect the black wires to an earthing point, not into the loom and connect the yellow wires to the indicator lives, DO NOT CONNECT ANY OTHER WIRES and let us know if the indicators now work ok.

I think either you have these wired in wrong or there is an earth leak on the circuit board, lack of diodes so power is being fed in reverse into one of the circuits creating a high resistive load. Excuse me if the terms aren't correct but I know what I mean

[Easy-X]

I second that: start with a bare minimum and build up. Before you do that though why not pull just the relay and give it some revs? If the indicators do anything then you have a pickle of a wiring problem but I suspect they'll do nowt. Then you can focus on the relay and its inputs.
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[stinkwheel]

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