…at the alternator, yeah, and roughly that across the battery.
But by the time it goes through thin wires and iffy terminals and tiny switch contacts and marginal grounds for the headlamps, it's gonna be a lot lower, hence the P = V × I and relays and stuff. You and I both know that, is the problem—makes it easy to leave stuff out that makes the people who don't yet know it go "aha!".
