Makes no sense thinking about it… Exposed to the elements… Is it really that hard to cover up some fat wires? Could be aesthetic of done properly.
In: Engineering
There is a lot of wiring inside the passenger compartment. Every switch, light, speaker, pedal, air bag, belt tensioner has wiring associated with it.
If everything was run internally, you would need far more holes in the body to connect to external sensors and actuators, all of which could be sources of water leaks and ways for road noise to get into the passenger compartment. Also internal wiring can be a source of squeaks and rattles which also makes riding in the car less pleasant.
A huge amount of time goes into designing the routing of vehicle wiring looms. None of it happens by chance. Engine compartment wiring is particularly difficult. Not only do you have to keep it away from things that will melt it, you have to give the wires enough slack that they aren’t broken as the engine moves relative to the body, but but so long that they catch on anything.
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