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Lighting Forum
Angel Eyes, DDEs, lighted rings, Clear Turn Signals, LEDs, Xenon, HID, or Bi-Xenon. If it lights up and you want to discuss it, post here!

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Old 02-10-2008, 09:54 PM   #1
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Led;s with Resistors = BAD IDEA

So I was installing the LED eagle eye deals with a 6ohm reistor turned on the right blinker felt it, I was like hmmm no heat, so I leave it that way for 5-10 next thing I know I go to touch it and it pratically burns me. So I coudn't imagine this being a good thing unless engineering by BMW or having a skilled mechanic strategically place the resistors somewhere.

I think the answer is somewhere in the LCM there has to be a wire that is doing the checking of lights to see if they are working.

We need to find that wire and cut the bastard.

Tom
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Old 02-10-2008, 10:03 PM   #2
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So I was installing the LED eagle eye deals with a 6ohm reistor turned on the right blinker felt it, I was like hmmm no heat, so I leave it that way for 5-10 next thing I know I go to touch it and it pratically burns me. So I coudn't imagine this being a good thing unless engineering by BMW or having a skilled mechanic strategically place the resistors somewhere.

I think the answer is somewhere in the LCM there has to be a wire that is doing the checking of lights to see if they are working.

We need to find that wire and cut the bastard.
Tom
i think the answer is to buy OEM.

even if you cut the check wire, it would still cause the problem since the check sends a pulse of power and the resistance is read as it completes the circuit. low or no resistence causes the fault code.
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Old 02-10-2008, 10:07 PM   #3
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They are supposed to get hot as hell. Around 200* F to be exact. You should have around a 15" cord so that you can place them somewhere that it can somewhat breathe.
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Old 02-10-2008, 10:17 PM   #4
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They are supposed to get hot as hell. Around 200* F to be exact. You should have around a 15" cord so that you can place them somewhere that it can somewhat breathe.
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Old 02-11-2008, 08:44 PM   #5
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Why 6 Ohm resistor???
I think you should be fine with a 47 Ohm power resistor and it wouldn't be that hot either.
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Old 02-12-2008, 12:31 AM   #6
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Why 6 Ohm resistor???
I think you should be fine with a 47 Ohm power resistor and it wouldn't be that hot either.
That's a good point would that work?

Tom
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Old 02-12-2008, 12:31 AM   #7
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Why 6 Ohm resistor???
I think you should be fine with a 47 Ohm power resistor and it wouldn't be that hot either.
That's a good point would that work?

Tom
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Old 02-12-2008, 02:19 AM   #8
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I used 50W 33Ohm power resistors with heatsinks for the leds bolted on an aluminum heatsink. Didn't get hot at all.

OP there's not a specific wire that checks for the bulbs. A 3v pulse is sent through the wires which are used to light the bulbs.

Three ways possible to get around the LED issue

Use power resistors (LOTs of DIY here)
Reprogram your LCM (if your car is made after 09/2001)
Get a NEW LCM (I stress the word NEW)
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Old 02-12-2008, 08:41 AM   #9
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The 33 Ohm that paraklas uses is the most guaranteed solution for the bulb out error but I think it is possible you can get away with 47 Ohm or even more in order to avoid the extra heat as the heat produced is conversely proportional(I hope this is how it is called in english) to the resistance.
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Old 02-12-2008, 09:03 AM   #10
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you can disable the rear tail light bulb check in your LCM if you get your hands on some of the BMW lab tools...
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Old 02-12-2008, 09:17 AM   #11
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you can disable the rear tail light bulb check in your LCM if you get your hands on some of the BMW lab tools...
I don't recall such option in the coding menu for the E46, since bulb check is a safety feature. Even if you disabled the check, you would still get fast blinking and flickering.
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Old 02-12-2008, 09:23 AM   #12
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correct resistors do wonders
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Old 02-12-2008, 09:18 PM   #13
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those resistors are self insulated, they wont melt or burn anything.
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Old 02-13-2008, 01:48 AM   #14
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those resistors are self insulated, they wont melt or burn anything.
Then why the hell did my fingers almost get burnt once I dropped them?

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Old 02-13-2008, 01:58 AM   #15
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Then why the hell did my fingers almost get burnt once I dropped them?

Tom
there is a big difference between your skin and some carpet. youll be fine bro
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Old 02-13-2008, 02:22 AM   #16
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there is a big difference between your skin and some carpet. youll be fine bro
You sure about that I mean that $hit got HOT!!

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Old 02-13-2008, 11:34 AM   #17
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You sure about that I mean that $hit got HOT!!

Tom
yup, just mount them and they will be fine. i have the same one in my car, but i dont touch the resistors, haha jk
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Old 02-13-2008, 11:41 AM   #18
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Im just a n00b when it comes to DIY'n on my E46 but I thought the LED Eagle Eye tails were p'n'p and all that good stuff.
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Old 02-13-2008, 12:09 PM   #19
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Im just a n00b when it comes to DIY'n on my E46 but I thought the LED Eagle Eye tails were p'n'p and all that good stuff.
thats what I thought and am hoping for

Quote:
Originally Posted by Tom/// View Post
So I was installing the LED eagle eye deals with a 6ohm reistor turned on the right blinker felt it, I was like hmmm no heat, so I leave it that way for 5-10 next thing I know I go to touch it and it pratically burns me. So I coudn't imagine this being a good thing unless engineering by BMW or having a skilled mechanic strategically place the resistors somewhere
Tom
Did you buy these from one of the group buys???
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Old 02-13-2008, 03:48 PM   #20
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Quote:
Originally Posted by Tom/// View Post
So I was installing the LED eagle eye deals with a 6ohm reistor turned on the right blinker felt it, I was like hmmm no heat, so I leave it that way for 5-10 next thing I know I go to touch it and it pratically burns me. So I coudn't imagine this being a good thing unless engineering by BMW or having a skilled mechanic strategically place the resistors somewhere.

I think the answer is somewhere in the LCM there has to be a wire that is doing the checking of lights to see if they are working.

We need to find that wire and cut the bastard.

Tom
lol when i first read it, i thought that you meant using LEDs (not LED tails) with resistors is bad.
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