Ha Ha, you fell for the old Vauxhall / GM dead bulb trick didn't you !!!
You're thinking "hold on though the 'Bulb off indicator' on the dash isn't lit but the foglight bulb doesn't come on ???
There is something posted elsewhere on the net about this problem as I had this problem too and I didn't believe either?
The thing is whilst all of the necessary hardware is there for the rear foglight on that side ie: lampholder, bulb, wiring etc! it isn't actually connected to the harness. Therefore you will never get the light to work because there is no power going to that particular light.
Vauxhall say that the bulb may be used as a spare for the other side though ??? handy that eh ?
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The turn signal circuit is different from the parking lights. So the headlights would not be involved. You should have power on one side of the bulb for parking lights and the other for turn signals. If you have no power for the turn signal circuit, I would look at the turn signal switch. It powers each bulb separately.
check behind the brake peadle for a little button that pushes in and out when the peadle is pressed(this is your brake light switch) some cars have more than one of theese. manualy let the button out if the light works the switch is good if it does not disconect the harness from the switch and take a small piece of wire and jump the two prongs on the harness if the brake lights come on then you need a brake light switch. if this doesnt work check for power at the switch. if no power you have a bad fuse if there is power and you already jumped the wires to the switch then you have a broken wire between the switch and the tail lights.
Yes it's true. What I did on my US-spec A4 is to pull back the trunk lining on the passenger (right) side, where there is no functional foglight (my rear fog from the factory is on the left side). What I found was that the "bulb tree" has a fully powered socket for a bulb that would fit into a rear foglight on that side, but no bulb was installed. The part of the taillamp that would have a hole for such a fog bulb had a **** instead. I used a drill to widen the **** into a hole large enough for a bulb, and installed a bulb in the bulb tree, and voila - dual rear fogs:)