LBMEFM
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| posted on 19/8/08 at 08:49 PM |
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LED Indicators
On the the point of chucking my LED indicators. I have LED front indicators from a bike, LED side repeaters and LED replacement bulbs in the the rear.
When I first wired it up I used bulbs and it worked perfectly, I then fitted the LED's and they stay on, do not flash. I bought a LED relay from
Demon Tweeks, did not work. Bought a unit from e-bay that works on bulbs, mixtures of LED/bulbs and LED's did not work. I been told I can use a
standard unit with a resistor wired in, but what size resistor do I need. It appears that you can work out the resistance of LED's but there is
no info on the units as regards wattage etc. What has anyone else done, how about a unit from a modern car with LED's?
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tegwin
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| posted on 19/8/08 at 08:52 PM |
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When I fitted LED lights to my POLO I wired in three 33 ohm 7W resistors in parallel.....That keeps the flashing rate down to normal..
However, the resistors get hot as they must consume around 15W of energy...
It really should not be too hard to get them to work with the LED flasher relay....Provided you dont exceed the limit of the flasher which for the LED
unit I have is 30W....
In my classic TVR I am fitting LEDs inside all of the old light clusters...
I will be using an LED flasher instead of massive resistors... I cant put my finger on the diagram I want, but there is one out there that is veerey
simple indeed....do a search for it on here...under "indicator wiring"...im sure thats where I found it!
[Edited on 19/8/08 by tegwin]
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Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
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smart51
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| posted on 19/8/08 at 08:57 PM |
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Do all the indicators come on? Then you have them wired the right way round. This is good.
Do you have a drop in replacement relay? Does it have the same number of pins as the original? Does it have an extra earth that you haven't
wired up yet?
I've done the same as you. LEDs all round. The LED relay I got off ebay. It does work.
Here's a test for you. wire all the indicators from the relay to ground as normal. Wire the earth to the relay if it needs it. put 12V from
the battery to the input of the relay using a spare piece of wire. Does it work?
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Bigheppy
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| posted on 19/8/08 at 08:58 PM |
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have you got the polarity of the LED's right
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LBMEFM
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| posted on 19/8/08 at 09:05 PM |
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Thanks guys, yes if I put a direct feed to the indicators they all light up on hazard or left and right on the switch. I replaced a the 3 pin unit
with a 3 pin unit. Just to check I'm right it is connected with, one wire from the fuse box feeding the unit, one to the ind/switch and the
third to earth.
[Edited on 19/8/08 by LBMEFM]
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Eggy
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| posted on 19/8/08 at 09:05 PM |
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As a rough guide:
assume 21watts per indicator bulb, so thats x 2 (1xfront and 1xrear) = 42 watts.
42 watts divided by 12volts =3.5amps
12volts divided by 3.5amps = 3.42 ohms per side if using all LED bulbs.
As above, both resistors will need to be +50watts!!!
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02GF74
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| posted on 20/8/08 at 06:47 AM |
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A LED relay will work with LED lamps; no need for dummy load resistors.
Pretty sure VWP sell one but you can buy them off ebay.
re: ^^^ resistor calculation, that is more or less correct but remember when alternator is running, voltage is closer to 14 Volt.
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smart51
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| posted on 20/8/08 at 07:56 AM |
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quote:
Originally posted by LBMEFM
Thanks guys, yes if I put a direct feed to the indicators they all light up on hazard or left and right on the switch. I replaced a the 3 pin unit
with a 3 pin unit. Just to check I'm right it is connected with, one wire from the fuse box feeding the unit, one to the ind/switch and the
third to earth.
[Edited on 19/8/08 by LBMEFM]
Sounds right. Do you have resistors or bulbs connected? The LED relay may not like that. Are you sure the new relay is an LED type? Do you have
the wires on the right pins of the relay? It should just work.
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