Here is something from Quora:
Why do black people think the African Berbers were black?
What do North Africans (Egyptians and Berbers) feel about west african Americans (Afro-Americans) claiming their ancestors were blacks?
As a Libyan Berber, i feel annoyed about that false claim. We Berbers have inhabited North Africa since the dawn of human history. We established many kingdoms and civilizations since thousands of years BC until the end of the Islamic golden age. Yet, not even one historical source ever mentioned Berbers as black. In fact many sources (especially the ones from Egyptians and Greeks) mentioned Berbers as white. The only Berbers who look black are the Tuareg people and one of the reasons of that is because in ancient times there was an advanced kingdom and civilization called “Germa” that was known for practicing slavery especially with women. The Garamantes were known for marrying four ethiopian slave women, which lead the later generations to adapt dark skin colour. The other reason why Tuaregs look black is because many black africans from the Sahara emigrated to North Africa and adapted Berber culture.