Quote:
Originally Posted by Spring44
Questions on the BiXenon headlights.
What car did they come from?
Do you also have to take the switch and wiring from the donor car?
Is the hi/lo beam mechanism built into the light unit?
Wiring diagram?
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The are generic units from ebay. Here is the original listing.
I do not have a wiring diagram but I can give you an outline of what was involved in getting them to work.
The standard lighting in the 944 has separate power wires going to two separate filaments, one for lowbeams and one for high beams. When you switch on the high beams the power to the low beam filament stops.
The BiXenons don't have two power wires and two filaments, they have just one power curcuit to the filament and a separate power circuit to the hi/lo beam metal plate.
If I ran the high beam circuit to just the hi/lo plate and the low beam circuit to the filament, every time I turned on the high beams the plate would move but the low beam circuit would shut off turning off the filament giving me a great hi beam pattern of no light at all.
I had to wire the high beam circuit and the low beam circuit to the filament but just the high beam circuit to the hi/lo plate.
Having both circuits wired directly into the filament together presented a problem. The high beams worked perfectly, the filament got power and the hi/lo plate got power and all seemed right in the world, but...
The low beams weren't...
low!
I git high beams no matter which beam selected. The power from the low beams was connecting to the high beam circuit and activating the hi/lo plate.
I needed to block the low beam circuit from powering the hi/lo plate circuit so I wired a diode ( a Schottky Barrier rectifier) between the low beam circuit and the hi/low plate.
This allowed the hi circuit to power both the filament and the hi/lo plate but blocked the low circuit from powering the plate.
The diode is in the little "C" shaped reddish-pink heat shrink tubing in the pictures.
I'll try to get some pics of how it is plugged into the car later tonight.
Here is the diode I used to make it work.
