Aux Lighting Hookup...

[Scrambler82]

So in simple terms, the relay is the 'gate' between the battery and the lights. The switch opens that gate, and the draw through that line is less than what the battery to light is. Is that correct or am I hopeless?

Good analogy !
YES you have it right, the relay gates the High current in a 12 Volt setup and ALWAYS FUSE THE POWER WIRES as close to the battery as possible.
That is why you always buy components by the amperage rating and you start with the total load on the circuit and in lighting circuits it is usually the Lights themselves.
You need to buy all of the components with a 25% to 50% amperage rating over that load figure, i.e. Relay, Wire, even connectors.

If you buy your components rated for the highest amperage and fuses rated for the lowest amperage rated component then your system should work and live for a while.
Wire is critical too, bigger is always better, within reason.
I like to keep my load wire gauge at 12 minimum (dependent on amperage rating of the load), that is from the battery to relay to the lights or load and the Relay Activation leads at 16-18 ga this has always worked out.

I am rattling on again, ltr,