[s-cars] Euro Lights question

[Paul Gailus]

I agree with Dave.
According to the Bentley schematic on page X67, if the common
ground to the left high and low beam bulbs is disconnected
then I would expect it to behave exactly as you are describing.

A circuit loop will be created with the left low beam bulb
connected in series first with the left high beam, and then with
the right high beam through 10A fuses S1 and S2. The normal
ground for the right high beam completes this loop.
In the low beam switch position these bulbs will glow dimly
because the battery voltage is split between all 3 bulbs.
The current "sneaks" through the left high beam bulb in
the reverse direction from what is normal.

When the high beam switch is on, this pulls up the common
high beam bulb connection to 12V, eliminating the reverse
current flow though the left high beam and shutting off both
left bulbs.


----- Original Message -----
From: <djdawson2 at aol.com>
To: <otw185 at yahoo.com>; <s-car-list at audifans.com>
Sent: Friday, June 24, 2005 11:24 AM
Subject: Re: [s-cars] Euro Lights question


> Somewhere, you have a bad ground... that behavior is typical when
something is poorly grounded.  You need to check all of the ground posts
inside each headlight assembly... there's one for each bulb.  Somewhere
you're loosing it, and getting feedback causing dimly lit bulbs and
indicators.
> Good luck.
> Dave
>
> -----Original Message-----
> From: otw185 <otw185 at yahoo.com>
> To: s-car-list at audifans.com
> Sent: Fri, 24 Jun 2005 08:57:00 -0700 (PDT)
> Subject: [s-cars] Euro Lights question
>
>
>
> Looking to be illuminated on a lighting issue:
>
> On my '92, I've upgraded awhile back to new OEM Euro Hella units (H1
Headlight,
> H1 Hibeam and H3 fog), which are a plug 'n' play replacement to the DOTs.
I'm
> not running any particularly high watt bulbs, Osram, Philips -- everything
is
> good quality stuff I got from PG Performance (always excellent to deal
with) and
> I've eliminated that the bulbs are the problem.  In each of the last two c
old
> seasons, I've had a couple, rare, instances where the following occurs
> simultaneously while they're on in the lowbeam position, independent of
whether
> I've got the front fogs on or not.  Now, I've got the problem
continuously:
>
> 1) The lowbeam on the driver's side is very dim - just enough to see it's
on but
> not emitting any useful light.  The passenger's side is normal.
>
> 2) Even though the switch is in the lowbeam spot, both sides' hibeam bulbs
are
> on anyway, but also just barely emitting light.
>
> 3) Inside the car, the blue highbeam indicator is also very faintly on,
but the
> message center is not indicating a light is out.
>
> Now, when I switch to highbeam mode, the message center immediately chimes
a
> light is out, and the driver's side unit goes completely dark, but the
> passenger's side has a healthy highbeam.
>
> I think it's a short since in the past I was able to give the driver's
unit a
> soft pound with the base of my hand and the problem was corrected.  I
don't see
> any obvious wiring issue inside the driver unit and made sure everything
appears
> to be connected correctly.  Anyone have a guess what's up before I take it
> apart?
>
> Cheers,
>
> Scott in OH
>
>
>
>
>
>
>
>
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