In 1977, the network of overhead wires was improved by rebuilding the intersection of ulica Świętojańska and ulica 10 Lutego, thereby reducing failures in traffic. Additionally, a section of new wires was built from ulica Jana z Kolna to plac Konstytucji, returning via ulica Migały. Preparations were made to expand line 23 to Stocznia. It was also decided to maintain and modernise the wires along ulica Wielkopolska, with an expansion to Wielki Kack. In 1975-1979, the trolleybus network returned to full operation in Gdynia. In 1980, production began for trolleybuses with electrical equipment by Berliet. The three trolleybuses produced acquired the numbers 10104 to 10106.