No clue on it blowing, but when i first bought my 1988 audi 90 i thought one of the rears was blown out, took the assembly apart and there is only supposed to be one. You might wanna take your 80 to a mechanic if you are not proficient in wiring.
It may be something as simple as a short in the wiring, or a bulb that's of an incorrect wattage and is drawing too much current. I'm guessing that it shouldn't be anymore than 50-60 watts, but I'm not entirely sure as the Australian model doesn't come with a rear fog light.
One very quick and simple test you might like to try - if you have access to a multimeter - is to take the bulb out, set a multimeter to measure resistance (ohms), and then touch a probe each to the two contacts for the bulb. If you get a reading of 0, then you probably have a short somewhere in the wiring.
Well i found the problem. I put a fresh fuse in the fuseblock, turned on the rear foglight and it stayed on for awhile. Then as soon as i shut the trunk the fuse popped. This explains why my dash light fuse has also be blowing on me. I soldered in all new wires in the harness and now it works perfect, and the lights in the rear shine brighter than ever.
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