[Peter-Flint]

I have fitted LED bulbs in my front indicators. The flashing rate is a bit quick for the regs; where/how would I fit a resistor/s to slub it (slow it down). The leds are 5W.

 

[Major_Sarcasm]

When I converted my old R32 to LEDs, I used UltraLEDs and bought a pair of their resistor packs. They get wired in series with the bulbs. Easy to fit.

Edit: Hmm, it was some time ago and they seem to have removed the resistor packs from their catalogue. Google 12v indicator resistor pack.

 

[ru']

Assuming standard indicator bulbs are 21W, and battery voltage is 12V:

5W taken by LED, so 21W - 5W = 16W we need to 'disipate'.

P=IV, so 16W = I x 12V, so I = 1.33 Amps we need to drain.

V=IR, so R=12V/1.33A, R=9Ohm ish.

So, you need a 9Ohm resistor which can handle at least 16 Watts.

If you've got a Maplin around you could use two of their 10W ones:

10 Watt Wirewound Resistor : High Power Wirewound : Maplin

(either 2 x 4.7 Ohm in series, or maybe 2 x 22 Ohm in parallel)

Simples

 

[Peter-Flint]

Thanks chaps. Where would we be without good old fashioned Ohms Law ?
Cheers.

 

[Peter-Flint]

Maplin have just the item, H10R, one each side should do the job. Flash with confidence. :clap:

Cheers, Peter.

 

[ru']

Apart from that can only handle 10 Watts, not 16W...

It may be okay seeing as the indicators flash rather than light continuously, however if you use two 10W resistors each can disipate 8W of the 16W (as per my post, lol)

 

[Peter-Flint]

I did mean one resistor per front indicator, not two per indicator. :thumbsup:

 

[ru']

I did mean two resistors per indicator, not two in total. :thumbsup:

 

[Cris]

Silly question but wouldn't it be easier to replace the flasher replays?

Even sillier question does anyone know where the flasher replays are on the R32?

 

[Robbie 733]

Even sillier question does anyone know where the flasher replays are on the R32?

And on a 34, as I might have to replace mine soon, too. :thumbsup:

 

[ru']

Not sure where they are (easy to find out; stick the hazards on and listen for the clicking relay...), but how would you get a flasher relay designed for LED bulbs? I didn't know they did various types.

 

[Robbie 733]

There are the old fashioned ones that work on the resistance generated by having 2 or 3 bulbs working. Hence when a bulg stops working, the remaining bulb(s) flash twice as fast.
The other type for LED's isn't like the above (you can see how great my technical knowledge is !) and generates a pulse that will work.

 

[ru']

Aaah, that makes sense.