Anything that uses more than 10 amps gets properly fused and has relays installed on the circuit. I power the relays through a 12V+ distribution lug located in the engine compartment, and that is often the starter relay lug. Of course, the typically 4 gauge cable from the starter relay to the battery continues the current flow from the alternator to the battery.
JBC, this is what I'd like to do, also, except for this; if I've read correctly, running a 12V+ distribution lug off the starter relay lug would mean you're powering these off the battery, and what I've read is that you need to power any added accessories off the alternator, so that you're not discharging the battery any further. I'm not talking about anything factory, like factory radio. Instead, I'm thinking aftermarket stereo amp, a light bar, a CB radio, a power/USB plug. Also not talking about a HEAVY draw item like an add-on, non-PTO winch ( I see where many folks run a 2nd battery under the hood for something like running winches or electric plows).
