I think I'll actually go 14 ga. 16 is on the low side for the advertised 2A load I'm planning on.Strobes are a heavy load flashing on and off. I would use 18 or 14 stranded wire.
Multi conductor cable is typically not rated for use outside or in the wet and mud.
I've never thought about number of strands being a factor. It must matter since residential wire is solid.
Everything will be in the cab so it just needs to stand up to heat and humidity.
The reason I thought to use multi-conductor is cause it's lower profile/ thinner than multiple wires in a wrap... easier to stuff under the headliner and behind trim. I have no clue about ratings of this stuff. All I see is copper (well.. Al for the cheap stuff but this will be Cu) coated in rubber. I don't even know what SAE means, but I've seen it allot. Speaker wire is my go to wire for basically all DC stuff cause it's cheap, packaged nicely, the correct number of conductors, and easy to work with. I'm sure that'll change if you follow up to this post thoughYou should use SAE approved automotive wiring unless you want to have problems later. Using solid wire or THHN in a car is asking for trouble. A car is a much more challenging environment than a building wall.
Yeah, that seems clever...
... but I've done a lot of work on cars and I've never seen factory harnesses made that way. They use individual wires, gathered into harnesses with spiral wrap and/or convoluted tubing. So yeah, build your own harness and done.
Yeah, shopping for electrical "online" rarely goes well, especially when it involves a large river in Egypt - I mean Brazil. Everything is stupid overpriced because experienced people don't buy online, so who's left? Novices (very high return rates) and fools who don't care what the price is (Adam Smith says fleece 'em).