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Led And Brake Light Voltage

3340TH

By 3340TH,
in R Series (R30, R31, R32, R33, R34)

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Samon

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Posted
I'm pretty sure the globes are all 24 volts in the rear lights

24??? This isn't a truck! The battery will put out 11.8-12v when the car isn't running, and when running the alternator will bring this up to between 13 and 14.4v. The voltage at the taillights is not reduced or boosted at all. just like your headlights... if you have a manual and you chuck it in first, turn on your headlights, and with the brakes on slowly let out the clutch a bit (i.e. stall the engine down to say 300-400RPM) you will notice them all drop in brightness. Only do this for a few seconds so you don't shag out your clutch though! If yours is like mine, and the voltage-regulator is on it's way out, it will drop a little in brightness even jsut idling compared to bringing up the revs a bit.

So short answer? 12V when car is off, 13-14.4V when running.

3340TH Collaborator

3340TH

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Posted
24??? This isn't a truck! The battery will put out 11.8-12v when the car isn't running, and when running the alternator will bring this up to between 13 and 14.4v. The voltage at the taillights is not reduced or boosted at all. just like your headlights... if you have a manual and you chuck it in first, turn on your headlights, and with the brakes on slowly let out the clutch a bit (i.e. stall the engine down to say 300-400RPM) you will notice them all drop in brightness. Only do this for a few seconds so you don't shag out your clutch though! If yours is like mine, and the voltage-regulator is on it's way out, it will drop a little in brightness even jsut idling compared to bringing up the revs a bit.

So short answer? 12V when car is off, 13-14.4V when running.

Thanks...I was just querying it, because i put LED lights in behind my dash in the vl, and worked the resistance on 12V.

This was 440ohm, but only come in 470ohms (closest). if i was to work it off 14.4 then i would have needed about a 560ohm resistor in it. They been in there for 2 years and haven't played up...

I'm working on making the illuminated skyline garnish for the 33, and didn't want to blow up the leds cuz its like 60bucks worth.

I'll just work off 14.4 as it is a safer option. And have worked out that it has the bigger resistors in it.

14.4v - 2.2v =

12.2v

12.2v / 0.075A =

162.66ohm

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