A field joint used to connect downhole tool modules. The field joint includes a bulkhead, a connector block, and various electrical connections. The bulkhead couples to a first tool module and has a first connection face, which partially defines an exterior of the first tool module and has a first conduit aperture that receives an electrical connector assembly. An electrical connector assembly received in the first conduit aperture is releasably coupled to the exterior of the first tool module, and includes a first connector. The connector block is coupled to a second tool module and has a second connection face defining a second conduit aperture positioned to face the first conduit aperture when the tool modules are joined. A second electrical connector disposed in the second conduit aperture establishes electrical contact with the first connector when the first and second tool modules are joined.