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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 09-23-2012, 04:55 PM
GirlBeemer GirlBeemer is offline
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Why two wires spliced into one

We bought a 2002 330ci convertible and the light display on the dash stays on showing the backlights have issues. While trying to figure out the issue, we noticed that when the LED lights were installed two wires were spliced into a single wire. Here's a pic...any suggestions or ideas why they did it?
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  #2  
Old 09-24-2012, 10:06 AM
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That's odd. So it tells you your rear lights are out? but there not?
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Old 09-24-2012, 10:10 AM
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Probably just a long shot, but is there any evidence of a trailer hitch ever being mounted under the back of the car ?
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Old 09-24-2012, 11:20 AM
GoForthFast GoForthFast is offline
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There is a known very common issue on some cars with a weak ground on the taillights. One fix for this is to run another parallel wire to ground to give the circuit a more solid ground.
I'm not sure which cars this applies to, and I don't think it was for cars with LED tails.
But that doesn't mean that someone didn't apply this to a car even tho it wasn't a car that was supposed to suffer from this malady.
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Old 09-24-2012, 02:05 PM
KenG KenG is offline
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Anyone correct me if I am wrong but maybe spliced for led tailight resistors?

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Old 09-25-2012, 12:27 PM
GirlBeemer GirlBeemer is offline
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Yes, the taillights work just fine, just have the warning lamp on that there is an issue. Unless the resistor is inside the taillight we're not sure...need to do some investigation.
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Old 09-25-2012, 01:03 PM
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Quote:
Originally Posted by GirlBeemer View Post
Yes, the taillights work just fine, just have the warning lamp on that there is an issue. Unless the resistor is inside the taillight we're not sure...need to do some investigation.
You need to change your sig line....your car is not an M3....
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Old 09-25-2012, 01:09 PM
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MalibuMafiaV MalibuMafiaV is offline
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Quote:
Originally Posted by GirlBeemer View Post
Yes, the taillights work just fine, just have the warning lamp on that there is an issue. Unless the resistor is inside the taillight we're not sure...need to do some investigation.
It does sound like a resistor issue. That's what I would check first. If your car didn't come with LED tails originally and the person didn't install resistors that would do it.

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You need to change your sig line....your car is not an M3....
lol.
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Old 09-25-2012, 05:41 PM
QAfred QAfred is offline
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Quote:
Originally Posted by GoForthFast View Post
There is a known very common issue on some cars with a weak ground on the taillights. One fix for this is to run another parallel wire to ground to give the circuit a more solid ground.
I'm not sure which cars this applies to, and I don't think it was for cars with LED tails.
But that doesn't mean that someone didn't apply this to a car even tho it wasn't a car that was supposed to suffer from this malady.
I thought that too, at first, then I realized the brown wires are ground on BMW's and that mod splices them together not the striped/hot wires he shows spliced together.
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