@VOLVO-V70 I’m all ears… can you tell me what to search for? E46 fuse set doesn’t turn up much.
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I can’t remember the last time I changed a fuse. Many cars have spare fuses in slots that are not active, so just check that.
I had cut the thermostat wire at the air conditioning compressor while whacking weeds. Had to call the hvac guy. After splicing the wire went to the furnace and replaced a blown fuse. Looked just like any other flat fuse. Nothing special.
The fuses can be purchased at an auto parts store, he is asking what the voltage ratings mean.
The parts department at the Lexus dealer I worked for would sometimes tell me “We don’t have that fuse, I will order one”. I brought an assortment of fuses from home so I could repair cars in a timely manner.
I am surprised someone didn’t ask how many miles are on the car? More questions than answers. Nobody needs to know the specific BMW model, the vehicle operates at 14.5 volts, 32-volt fuses are sufficient for common passenger cars.
Very nicely stated.
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I was asking why he needed to order online. The last time I change a fuse was on my lawn mower. 20Amp, I never looked at the brand or voltage, just grabbed it off the rack at an auto parts store. Then found the short causing the fuse to blow
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It seems simple but the choice of fuse in the design is a rather complex analysis taking into account all the factors; type of power, wiring, interconnections, load dependencies and so on. There are many fuses available to satisfy the myriad of different scenarios. Fortunately, for something like an automotive fuse, the replacement choice is rather forgiving.
I’ve worked on fuzing (sic) for missiles. It’s like the exact opposite of a fuse. It is designed to produce and sustain a plasma arc upon activation. These are used on our arsenal of submarine launched Trident II D5 nuclear missiles. There, it is bad if it does not sustain the arc when activated. It would be really, really bad if it activated prematurely 
Light fuze and get away…
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