Brake wiring
 

Hello everyone. New here. Was wondering if anybody has had any problem with the wiring on their brake system. So I seem to have lost power to my brake lights. Then looking at the wiring. Have a diagram and a Hanes book. However the wires keep changing colors. Does not show it in this book. It says go to the fuse box in the trunk and will find these numbers. Cannot find them. It's a numbers of the wire going into a connector box. I cannot find any of the numbers on that connector box. For example the LED brake lights, says it is black and blue but it winds up being brown and yellow soda. Says it goes to number H1 / 7 and h2/15. Can anybody please tell me where those numbers are? And thanks by the way.
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Haynes wiring diagram.