where is the voltage/generator regulator be Fiesta bj.95

Hello! I have an important question. My girlfriend bought a Ford Fiesta (lll, GFJ, Built. 95, 1299 sqm). After the car did not jump on the first time we charged the battery and it ran again a few days. Charging voltage was right. At some point the battery was flat again….my conclusion: accumulator broken! I bought a new one then. That went well then also a few weeks. Now the car does not jump on again. When I then measured the battery voltage, ic h me wondered. Something I must have done wrong because my multimeter showed me 207V!!! Already in idle the charging voltage is about 22V. After my experiences the voltage/generator regulator is broken. But where does it sit???? Have a book from 89`Bj. there is described that it should sit at the back of the generator. But that doesn’t look like this, and before I take everything together I wanted to ask. I thank you already in advance for every productive e answer!!!