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#1
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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
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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. -- The instructions said to use Windows 98 or better, so I installed RedHat. |
#3
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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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