A connection system (40, 40a, 40b, 40c) for joining two wind turbine components (42, 44) together, comprising: on a first wind turbine component, one or more bearing surfaces (46, 46a, 46b, 46c), one or more support surfaces (48, 48a, 48b, 48c) extending away from the one or more bearing surfaces (46, 46a, 46b, 46c), and one or more bores (60, 60a, 60b, 60c) formed in the one or more support surfaces (48, 48a, 48b, 48c); on a second wind turbine component, one or more bearing surfaces (50, 50a, 50b, 50c), one or more support surfaces (52, 52a, 52b, 52c) extending away from the one or more bearing surfaces (50, 50a, 50b, 50c), and one or more bores (70, 70a, 70b, 70c) formed in the one or more support surfaces (52, 52a, 52b, 52c); one or more pins (80, 80a, 80b, 80c) configured to be engaged with respective one or more bores (60, 60a, 60b, 60c, 70, 70a, 70b, 70c) of the first and second wind turbine components (42, 44) to thereby join the first and second wind turbine components (42, 44) together, wherein when the first and second wind turbine components (42, 44) are to be joined, the first and second wind turbine components (42, 44) are positioned relative to each other such that the one or more bearing surfaces (46, 46a, 46b, 46c, 50, 50a, 50b, 50c) generally confront each other, the one or more support surfaces (48, 48a, 48b, 48c, 52, 52a, 52b, 52c) generally confront each other, and the one or more bores (60, 60a, 60b, 60c, 70, 70a, 70b, 70c) in the first and second wind turbine components (42, 44) are generally aligned with each other or become generally aligned with each other upon engagement of the one or more pins (80, 80a, 80b, 80c), wherein the first wind turbine component includes the base frame of the nacelle. on a first wind turbine component, one or more bearing surfaces (46, 46a, 46b, 46c), one or more support surfaces (48, 48a, 48b, 48c) extending away from the one or more bearing surfaces (46, 46a, 46b, 46c), and one or more bores (60, 60a, 60b, 60c) formed in the one or more support surfaces (48, 48a, 48b, 48c); on a second wind turbine component, one or more bearing surfaces (50, 50a, 50b, 50c), one or more support surfaces (52, 52a, 52b, 52c) extending away from the one or more bearing surfaces (50, 50a, 50b, 50c), and one or more bores (70, 70a, 70b, 70c) formed in the one or more support surfaces (52, 52a, 52b, 52c); one or more pins (80, 80a, 80b, 80c) configured to be engaged with respective one or more bores (60, 60a, 60b, 60c, 70, 70a, 70b, 70c) of the first and second wind turbine components (42, 44) to thereby join the first and second wind turbine components (42, 44) together, wherein when the first and second wind turbine components (42, 44) are to be joined, the first and second wind turbine components (42, 44) are positioned relative to each other such that the one or more bearing surfaces (46, 46a, 46b, 46c, 50, 50a, 50b, 50c) generally confront each other, the one or more support surfaces (48, 48a, 48b, 48c, 52, 52a, 52b, 52c) generally confront each other, and the one or more bores (60, 60a, 60b, 60c, 70, 70a, 70b, 70c) in the first and second wind turbine components (42, 44) are generally aligned with each other or become generally aligned with each other upon engagement of the one or more pins (80, 80a, 80b, 80c), wherein the first wind turbine component includes the base frame of the nacelle.