The way I read it, he has one bulb set up for turn signals and another bulb set up for brake lights. Typical installations are the turn signal / brake combo light where you would wire the single bulb through the switch. So, if the brake light is separate from the turn signal, the turn signal light goes through the turn signal switch. The brake light bulb would be separate from that system and only wire through the brake light switch. Steve H has it right.
