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      10-14-2018, 11:02 AM   #2
02Pilot
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Drives: 128i
Join Date: Jul 2017
Location: NY

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A few general points:

- Check your local V&T codes - some localities limit the number of illuminated forward bulbs to 4.

- Fogs need to be low to be effective. Ideally, they should be manually switchable out of the low beam circuit, so that you can run the fogs with no low beams (assuming you actually want them for use in fog, as opposed to just driving around with a lot of useless light dumping 30' ahead of you).

- They should automatically turn off with high beam activation, and be set up so they cannot be run in conjunction with high beams under any circumstances.

- It is best to run any auxiliary lighting off a dedicated relay. You will want to set it up so that the wiring of the relay fulfills the conditions described above. I would suggest using a fused relay so that you don't need to wire a fuse elsewhere in the circuit.

Wiring on modern cars is rarely as simple as just finding a power and a ground, at least if you want to do it right. Prefabricated harnesses are out there, but know what you're looking for before you start shopping.
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