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Led blinkers lights flashing retardedly fast. 

 

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 Post subject: Led blinkers lights flashing retardedly fast.
Posted: Mon Apr 04, 2005 4:55 pm 
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My Au XR8 has clear tail lights. I dont really like them but cant be bothered modding them yet to how i want them.

Problem is the blinkers flash like there is a broken bulb. I know this is usual when replaced by leds. But how do i slow them down? Costs? Where can i get the part from?

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Posted: Mon Apr 04, 2005 4:57 pm 
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Geez, tough one.

I would think you would need to increase the resistance in the circuit to match the resistance which was present with the globes in order for the flasher unit to operate correctly.

 

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Posted: Mon Apr 04, 2005 5:03 pm 
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just put a regular indicator inside the guards somewhere to put load onto the system, they'll work fine then. you can put a resistor in but i have no idea what size to use.

 

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Posted: Mon Apr 04, 2005 5:15 pm 
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talk to regie...he found a solution to the problem! shouold be in the exterior mods section somwhere :P

 

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Posted: Mon Apr 04, 2005 6:22 pm 
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add a resistor - cheap. Need two 10 WATT (ie. big a***) ones (one for left, one for right), again unsure of the size, but it'll need to be a resistive as two regular bulbs.

Alternatively you can get LED compatible flasher relays.

 

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Posted: Mon Apr 04, 2005 6:39 pm 
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Is the flasher still mechanical in AUs? Why not replace it with an electronic one (I'm positive places like DSE and Jaycar have kits for this as I remember Silicon Chip publishing one at one point) which shouldn't be affected by the resistance? Or do the units do this on purpose to comply with ADRs or something?

 

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Posted: Mon Apr 04, 2005 7:40 pm 
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LSD wrote:
Is the flasher still mechanical in AUs? Why not replace it with an electronic one (I'm positive places like DSE and Jaycar have kits for this as I remember Silicon Chip publishing one at one point) which shouldn't be affected by the resistance? Or do the units do this on purpose to comply with ADRs or something?


Seeing as a LED indicator would not die in the lifetime of the car, I wuoldn't worry about it. 100,000+ hours of on time, that's a LOT of indicating.

 

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Posted: Mon Apr 04, 2005 8:08 pm 
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Nonono, I'm talking about the flasher can under the dash. Specifically, replacing it with an electronic one that isn't affected by the lesser resistance of the LED lights over the incandescents. What I was worried about was if the lights flashing faster when one of the globes dies is actually intended behaviour and not just a side-effect of using a bi-metallic strip to do the flashing.

 

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Posted: Mon Apr 04, 2005 9:16 pm 
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send me a PM i will give u an email address where i got my LEDS from

 

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Posted: Mon Apr 04, 2005 9:32 pm 
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electronic flasher relays are affected by the wattage of the bulbs that are in thier circuit, but i know hella make flasher relays that are specifically for cars/trucks with LED indicators

 

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Posted: Mon Apr 04, 2005 9:33 pm 
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LSD wrote:
Nonono, I'm talking about the flasher can under the dash. Specifically, replacing it with an electronic one that isn't affected by the lesser resistance of the LED lights over the incandescents. What I was worried about was if the lights flashing faster when one of the globes dies is actually intended behaviour and not just a side-effect of using a bi-metallic strip to do the flashing.


I was agreeing with you, in the point that having the flasher 'notify' you when a bulb is dead, isn't going to be a problem with LEDs. So therefore a electronic flasher shouldn't be a problem.

 

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Posted: Mon Apr 04, 2005 10:26 pm 
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Wrong fuse ?

 

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Posted: Tue Apr 05, 2005 1:51 am 
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When you change to LED Indicators your supposed to get LED Indicator Flasher Relay as well.

Obviously as mentioned the resistance is different, EBAY has plenty. Do a search there approx $2-15
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Posted: Tue Apr 05, 2005 6:05 pm 
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data_mine wrote:
add a resistor - cheap. Need two 10 WATT (ie. big a***) ones (one for left, one for right), again unsure of the size, but it'll need to be a resistive as two regular bulbs.

Alternatively you can get LED compatible flasher relays.


I have to bite data_mine - would you be refering to a 10 OHM resistor, amp being a measure of current and ohm being a mesure of electrical resistance

 

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Posted: Tue Apr 05, 2005 6:41 pm 
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Punnisher_42 wrote:
data_mine wrote:
add a resistor - cheap. Need two 10 WATT (ie. big a***) ones (one for left, one for right), again unsure of the size, but it'll need to be a resistive as two regular bulbs.

Alternatively you can get LED compatible flasher relays.


I have to bite data_mine - would you be refering to a 10 OHM resistor, amp being a measure of current and ohm being a mesure of electrical resistance


and WATT being a measure of power (speciafically amps x voltage). A resistor pretending to be a 21W light bulb is going to pump out a lot of heat, a 1/4W resistor will burst into flames. A 10WATT resistor will get DAMN hot.

21W bulb @ 13.8V = 1.5A
therefore the bulb is 9.3Ohms ( P=(I^2)R solve for R )

to replace TWO bulbs (ie a side) you'll need a 4.6Ohm resistor (as the bulbs are wired in parallel).

4.6Ohm @ 13.8V = 3A = 41W

2x 10Ohm resistors in parallel = 5Ohm
5Ohm @ 13.8V = 2.7A = 38W

Now the two 10WATT 10Ohm resistors will handle 38W for a 50/50 duty cycle (indicators flash!).

If you want to be really safe, make em 12Ohm 10Watters (31W of heat). Dunno if that will eb enough to trigger the flasher properly.

 

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