Re: Euro Lights Hi Beam Stays On

[Huw Powell <audi@mediaone.net>]

I don;t your car or its wiring conventions, but my experiences might
help shed a tiny glimmer of light at least.  One is that (in the old
days at least) many Audi switches, and certainly the headlight ones,
switch to *ground* when off, not just "no voltage".  Second is that the
typical Bosch relays like I play with (scavenged parts) switch "on" at
about 8 or 9 volts but do not turn "off" until 5-6 volts.

All this meant in my example is that two relay coils in series between a
12 v sourse and ground would cause either to stay of once triggered
(since it would have just over 6 volts across its coil)

Just my 2c, less inflation since the early eighties...

Fred Munro wrote:
> 
>     I just installed the Euros in the S4 today. I relayed the highs only and
> left the lows via the stock wiring until I sort out the DRL system.
>     I mounted the relays in the headlight buckets and ran a fused 12 gauge
> feed to each from the alternator and a 12 gauge wire to ground. The stock
> high beam wiring triggers the Bosch relays.
>     When I tested the lights, lo and behold, the highs came on but would not
> go off when the lows were selected until the headlights were turned off - I
> didn't have to turn off the ignition as Denny reported in his post. There is
> a residual voltage on the high circuit when the low beams are selected -
> about 0.15 volts.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

82 Audi Coupe; 84 4kq; 85 Coupe GT; 73 F250