29 replies to this topic

[Ol timer]

gday people.
I have recently replaced my indicator bulbs for LEDS...I also installed a new flasher designed for LEDS. however I have a bit of an issue

the issue I have is a weird one and involves the indicators 

I have a 1972 mk3 mini 

I have installed the new flasher unit and I replaced one bulb at a time to make sure it worked before I moved on to the next. 


the front ones were fine. but as soon as I put the back ones in and hit the indicator to turn left all 4 light up like hazard lights which I don't have.  


If i indicate to the right the right one works but both back ones come on.


 I can only get indicators to work if I only replace the front bulbs with LEDS 


if you have any ideas what to look for I welcome your advice

[Shaun78]

Hi,have you changed out the tell tale on the dash for an led if not this could be your problem,I think it could be sorted by putting resistors in the left and right circuit to load the dash tell tale light.

[Ol timer]

thanks for the reply Shaun. I presume you mean the little green light above the speedo.no I haven't changed that. Will have a look (weekend job)

[IronmanG]

Ye i had to do that.
Classic LED sell a diode set for about 6 quid or something. As I had bought my LEDs from them they sent it out free of charge

[Ol timer]

Ye i had to do that.
Classic LED sell a diode set for about 6 quid or something. As I had bought my LEDs from them they sent it out free of charge

thanks for that. I bought mine from them too. so we're yours doing the same thing ?

[humph]

So I've just done this on my 69 Elf project & had similar issues.  Check all your earths, that seemed to be my issue.  Specifically it was the bundle of earths that mount to the speedo body. I haven't put any resistors in the system and the system works correctly with either a filament bulb or LED in the dash.

Edited by humph, 05 April 2022 - 08:04 PM.

[Red Riley]

You'll probably need a load resistor since the LEDs pull less current than the old bulbs. Look Here. https://www.superbri...erflashing/275/

[IronmanG]

Ye i had to do that.
Classic LED sell a diode set for about 6 quid or something. As I had bought my LEDs from them they sent it out free of charge

thanks for that. I bought mine from them too. so we're yours doing the same thing ?

Its the diode harness kit.
Similar. Hazards worked fine but individual indicators didn't. I rang them up he said it was because they need such a tiny current to work it could draw it through the central indicator warning light

https://www.classicc...=15300431577197

[Spider]

It sounds to me that the Earth for the Rear Right is dodgy, but check them both.

It may be the Earth in the fitting itself, not necessarily the Earth Wire.

[Ol timer]

It sounds to me that the Earth for the Rear Right is dodgy, but check them both.

It may be the Earth in the fitting itself, not necessarily the Earth Wire.

I did notice the earth in front drivers side was a bit cruddy as the LED flickered until I gave it a bit of a clean. Will check the backs as well...not keen on ripping the dash out just to put indicators in the rear....all the others are fine.. brakes rear lights and head lights

[sonscar]

Always seems counter intuitive to me,fit low power LED then add resistors to up the power again.What do I know eh?,Steve..

[Spider]

Always seems counter intuitive to me,fit low power LED then add resistors to up the power again.What do I know eh?,Steve..

 

I run LED everything, except the headlights.

For the Indicators, I don't fit resistors, but just use an LED Flasher Can.

But, even so, there is I think a considerable difference between incandescent lamps and LEDs in their light up time, can be a life saver in regards to brake lights.

[Ol timer]

got this email from Classic car LED

The wiring for the indicator warning light is likely to be causing this sympathy flash issue.  
It is likely to be wired between the left and right hand circuit and does not have a dedicated earth so earths on the opposing side. 
The current that goes over to the other side to find earth is not enough to light incandescent lamps but is enough to light LEDs and cause this "sympathy flash".


You can check that it is this wiring that is causing the issue, by removing the lamp from your indicator warning light. 

You should then find that the indicators work properly. 

To fix the issue permanently, you need to isolate this lamp from the opposing circuits and provide an earth for it. 

We build a harness kit as a simple cure.  You need the negative earth version which will be back in stock later this week

[sonscar]

Spider,I am not saying fitting LED is bad but fitting resistors etc to make them work is perhaps not the best way to make them work.Electricity seems to be a mystic black art to some and there seems to be a lot of less than optimal kit for sale.Steve..

[Ol timer]

this loom has made me think. seeing this error makes all 4 indicators flash and a new loom for the dash light is required. if you could put a switch in the loom you would,in theory create hazard lights for a car that doesn't have them