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Dashlight Dimmer Not Working With Leds.

B0oStEr

By B0oStEr,
in General Maintenance

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B0oStEr Mentor

B0oStEr

Posted
Posted

I know my dashlight dimmer used to work but i haven't had a need to adjust it since I bought the car.

Now I've fitted LED bulbs to the dashlights and I tried to turn them down but the dimmer doesn't work anymore.

It's either full bright or off.

The aftermarket boost gauge that used to dim doesn't dim either.

I don't see how fitting the LEDs could cause this but I have only noticed it after fitting them.

wraith_skyline Proficient

wraith_skyline

Posted
Posted

Thats pretty much right, being diodes they have a certain voltage when they are on and once that is hit they are on, thats it so the dimmer wont work at all, mybe you could put a smoked cover on them to dull them down

Kinks Grand Master

Kinks

Posted
Posted

standard, no. a lot of them had dimmers fitted for compliance though.

me, I put brighter globes in. the standard dash is dimmed from the factory :)

LEDs have a fixed voltage across them, but more than that they don't scale linearly with current. If you put 20mA through one it's not twice as bright as if you put 10mA through one. Unlike a regular bulb which drops off in brightness very quickly if you try and dim it.

B0oStEr Mentor

B0oStEr

Posted
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Posted
Thats pretty much right, being diodes they have a certain voltage when they are on and once that is hit they are on, thats it so the dimmer wont work at all, mybe you could put a smoked cover on them to dull them down

Actually this isn't the case.

I have solved this problem by changing the original variable resistor (0-7.5ohm) with 500mA variable resistor from Dick Smith (0-500 ohm) and the LEDs dim progressively from full bright right down until they go out.

In fact it works so well my aftermarket boost gauge also dims at the same level which surprised me somewhat.

jeffworld2 Veteran

jeffworld2

Posted
Posted

anyone know why the r33 dash keeps blowing leds? ive tried a few different sets which are for the gtst's and they all seem to burn. first the one at 80-180km/h then the rest. I dont beleive they are loose or anything im trying to work out whats happening

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