Dash leds...

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Dash leds...

Post by demonbluedays » Sun Oct 07, 2018 12:18 am

I know it's been over a month but....spegru, do those coloured plastics come out of the unit?
If they do, I'd change the colours to:

Green for flashers

Red for ignition and brakes

Blue for full beam

Blue/yellow for low fuel

And yellow for rear heated screen


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Post by spegru » Sun Oct 07, 2018 9:13 am

Yes the coloured bits come out and are easily swappable. I even bought a spare triumph unit to get extras. But in the end I decided not to change the colours.
I also have the relevant LEDs on order, but was advised to go with warm white instead of yellow due to low output.
I hope to get it all put back togther soon



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Post by demonbluedays » Sun Oct 07, 2018 11:19 am

Fantastic, thanks, may consider the colour swap at some point in that case :mrgreen:


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Post by spegru » Sun Nov 11, 2018 10:40 am

Well my LEDs for the centre warning light cluster have arrived from www.classiccarleds.co.uk.
A mix of +ve and -ve earth, according to the scheme earlier in this thread.
Now to install them.
I shall also have to work out the resistor needed to work the alternator. Probably needs to be soldered directly onto the cluster PCB - so I may just leave that one till last
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Dash leds...

Post by scimjim » Sun Nov 11, 2018 10:48 am

There is another option for the alternator light rather than modifying the cluster - leave the existing light in series secured behind the dash somewhere?


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Post by philhoward » Sun Nov 11, 2018 11:40 am

I think you need a 68 Ohm 2W resistor in parallel with the LED from memory?


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Post by AJL Electronics » Sun Nov 11, 2018 1:56 pm

Or use a relay. That will also be handy as a towing power feed then, too.


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Post by spegru » Mon Nov 12, 2018 9:57 am

Thanks for those. 68ohm should result in a current draw of 17mA or 2W according to my calculations. Sounds a bit high if anything? Not sure what the rating of the bulbs is - 0.5W maybe?
I didn't understand the relay idea though?

The main problem I have is I can't get the LEDs to screw in at least not with fingers - just a bit too tight
According to my micrometer the inner thread diameter is ~0.1mm larger. A bit of fine adjustment of the bulb holder strips may be necessary
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Post by philhoward » Mon Nov 12, 2018 10:03 am

Pretty sure it’s a 2.2W bulb for alternator sensing. You might get away with a slightly higher resistance but might run into issues with it not switching to charging mode until you get a few more revs on the dial.

Don’t forget it only consumes power for a short while ( between turning on the ignition and the engine running) but even so I’d still go with a 2W resistor.


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Post by AJL Electronics » Mon Nov 12, 2018 10:19 am

When you have a full towing electrics setup, you need a high curent feed which is only high when the engine is running. The sensible place to take this trigger from is the WL terminal on the alternator. So, if you don't want a filament bulb there, you can connect a relay coil instead to provide the load required. The relay will energise when the WL goes low and so can be used to provide that high current feed to the towbar.


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