Alternator tell-tail light conundrum

[hair bear]

Here's a question for you...
If a 12v negative earth system is using the dash board tell-tail bulb for the exciter line, what would happen if I upgrade the bulb for an led equivalent to make it brighter, remembering the led will only allow current to travel one way.
All opinions, including sniggering, welcomed!

[essexpete]

https://electronics.stackexchange.com/q ... p-with-led
Looks like there are confusions out there!

[gecko.cx]

The lamp only needs to pass current one way, so the fact it's a diode isn't the problem.
The problem is that it requires so little current to light an LED, it won't excite the alternator.

If you use 2W LED, it will excite the alternator and there is little chance you'll be able to ignore it.

Edit:
For reference, 2W is about right - (it's not just a random number)

[hair bear]

Thanks for the insights, I think I'm leaning towards the 'leave well alone' verdict for the moment as this machine needs lots of other things done as well.
Cheers.

[essexpete]

I have a similar issue with 2 agricultural trailers with led lights. There is not enough draw on the indicator circuits to light the trailer warning light on the tractor dash.

[hair bear]

If the trailers are new they should have been fitted with resistors in the system to correct the draw. You get similar issues with can-bus cars and led trailers.

[essexpete]

If the trailers are new they should have been fitted with resistors in the system to correct the draw. You get similar issues with can-bus cars and led trailers.

Not new but fitted from new.

[Slooby]

I have a similar issue with 2 agricultural trailers with led lights. There is not enough draw on the indicator circuits to light the trailer warning light on the tractor dash.

You can get flasher relays designed to run LED's for just this situation

[essexpete]

I have a similar issue with 2 agricultural trailers with led lights. There is not enough draw on the indicator circuits to light the trailer warning light on the tractor dash.

You can get flasher relays designed to run LED's for just this situation

How and where to fit?

[Slooby]

How and where to fit?

You replace the stock flasher relay with one like this:

https://www.ebay.co.uk/itm/272665874287 ... media=COPY