Various methods and systems are provided for an electrical testing apparatus for an electrical panel and associated wiring harness. In one embodiment, an electrical testing apparatus includes a common housing; a first connector tethered to the housing via a first plurality of wires extending away from and coupled within the housing, where the first connector is adapted to connect to an electrical panel; a second connector mounted to the housing and adapted to connect to a wiring harness of the electrical panel, the wiring harness including a second plurality of wires; and a third connector mounted to the housing and including a plurality of test points for testing an electrical signal passing through each wire of the second plurality of wires.