Re: 90 V8 Quattro

[rawaudi@frugal.con (RWheeldon)]

On 9-15-96, Dave Senum wrote:

>I am in need of the instructions for wiring my high beams, low beams and fog
>lights such that they can all be on at the same time.
>

The easy part is getting the front fog lights turned on.  I wanted to be
able to turn on the fog lights without turning on the headlights.  The
solution is to remove the fog light relay (#7 in fuse/relay panel) and
install a jumper between contacts 30 and 87.  With the jumper installed, the
fog lights can be switched on whenever the ignition switch is in the "run"
position.

WARNING:  I have not tried out the headlight mod.  Proceed at your own risk.
I assume NO responsibility for any damage this modification may cause.

To get the low beams on with the high beams on, I think it will take a relay
(or two).  What I think I would do is insert a double throw relay contact in
both of  the Yellow (right) and Yellow/Black (left) low beam light wires.  I
would wire the common contact to headlight, the "normally closed" contact to
the Front Lamp Control Unit and the "normally open" contacts the battery.  I
would tap onto either of the high beam wires (white or white/black) and use
that to drive the relay coil.  The other end of the relay coil would be
grounded.

A wire diagram would look something like (if our ASCII graphics translate OK):

                                            NC    _____________ Front Lamp
Control Unit (yellow)
Yellow                                        /
Low Beam socket________/      ___________10 Amp Fuse______ Battery 
                                                    NO


                                            NC    _____________ Front Lamp
Control Unit (yellow/black)
Yellow/Black                             /
Low Beam socket________/      ___________10 Amp Fuse_____ Battery 
                                                    NO

High Beam Socket______________________Fuse S8 or S9
                                        |
                                        |______/\/\/\/\/\/\________Chassis
Ground
                                                        Relay
                                                         Coil

If you cannot find a two pole double throw relay, you could use two single
pole, double throw relays.

I have intentionally not connected the battery (thru relay contact) to the
Front Light Control Unit because I don't know what would happen if you
applied 12 volts to the outputs.  Probably nothing but I bet it is expensive
to replace if it did get damaged.

I have not taken the time to figure out where to pickup the battery
connection but my first thoughts are with the jump start terminal.

I can sketch this mod up and if anyone wants to send me thier fax number, I
will fax the sketch to them.

WARNING:  I have not tried out the headlight mod.  Proceed at your own risk.
I assume NO responsibility for any damage this modification may cause.

PS.  There are few things Engineers fear more than a Lawyer or Reporter with
20/20 hindsight.

Bob Wheeldon
'90 V8Q
Principal Engineer
Boeing Commercial Airplanes
robert a wheeldon@boeing.com
rawaudi@frugal.com