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1990 535i right low beam trouble



 
 
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  #1  
Old September 28th 04, 11:21 PM
mark barron
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Default 1990 535i right low beam trouble

The voltage at the plug (at the halogen bulb) is 11.85 V but the bulb
will not burn. The lowbeam bulb on the other side is working
at 11.96 V. I have tried three different bulbs and none work
on the right side (I even tried the working one from the left side)
Is there some kind of voltage cutoff for halogen bulbs?

I have pulled the LKM and examine the solder on the
three (yes three) relays. Solder looks fine to me.

Using the photo at:
http://www.bmwe34.net/E34main/Mainte...trical/LKM.htm

my LKM is missing relay #2 compared to the LKM in the photo, numbering
1-4 left to right.

Thanks, Mark


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  #2  
Old September 29th 04, 12:10 AM
Jim Levie
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Default

On Tue, 28 Sep 2004 18:21:04 -0400, mark barron wrote:

> The voltage at the plug (at the halogen bulb) is 11.85 V but the bulb will
> not burn. The lowbeam bulb on the other side is working at 11.96 V. I have
> tried three different bulbs and none work on the right side (I even tried
> the working one from the left side) Is there some kind of voltage cutoff
> for halogen bulbs?
>

The correct test is to measure the voltage between the power and ground
leads of the connector with the bulb in the circuit and then to measure it
from the power to chassis. The possibilities then a

1) Between power and ground is zero, but power or ground to chassis is
~12v indicates a fault in the ground lead.

2) Between power and ground is ~12v and the bulb doesn't light indicates
an open circuit in between the pins. Possibly an open filament or bad
connection.

3) Between power and ground is significantly less than 12v indicates a
high resistance in the supply.

4) Between ground and chassis is much more than zero indicates a
high resistance in the ground.


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  #3  
Old September 29th 04, 12:56 AM
Dave Plowman (News)
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Default

In article >,
mark barron > wrote:
> The voltage at the plug (at the halogen bulb) is 11.85 V but the bulb
> will not burn.


If you've got volts at a known good bulb, then either the connector or
ground is faulty.

--
*Of course I'm against sin; I'm against anything that I'm too old to enjoy.

Dave Plowman London SW
To e-mail, change noise into sound.
 




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