A control test device for testing a dual starter system having a first and a second starter, each starter (102a, 102b) having a starter electrical interface (106, 106a, 106b) including a starter crank signal interface and a starter status signal interface, the control test device comprising: a first communication interface (220, 220a) for communicating an electrical test signal to the first starter, wherein the first communication interface (220, 220a) includes a first electrical interface for interfacing with the first starter electrical interface; a second communication interface (220, 220b) for communicating the electrical test signal to the second starter, wherein the second communication interface (220, 220b) includes a second electrical interface for interfacing with the second starter electrical interface; a switch mechanism operable to direct the electrical test signal to the first starter or the second starter, each of the first and second starters electrically interlocked from starting unless the corresponding starter receives a neighbor-status signal indicating that the other starter is operational; and an electric circuit for generating the electrical test signal directed to the first starter to test whether the first starter is inoperable when the switch mechanism is operable in the first position, the electrical test signal including: an electric crank signal communicated to the crank signal interface of the first starter to start the first starter; and an electric status signal (350, 350a, 350b, 360, 360a, 360b, 505) communicated to the starter status signal interface of the first starter, the electric status signal (350, 350a, 350b, 360, 360a, 360b, 505) simulating the neighbor-status signal indicating that the second starter is operational. a first communication interface (220, 220a) for communicating an electrical test signal to the first starter, wherein the first communication interface (220, 220a) includes a first electrical interface for interfacing with the first starter electrical interface; a second communication interface (220, 220b) for communicating the electrical test signal to the second starter, wherein the second communication interface (220, 220b) includes a second electrical interface for interfacing with the second starter electrical interface; a switch mechanism operable to direct the electrical test signal to the first starter or the second starter, each of the first and second starters electrically interlocked from starting unless the corresponding starter receives a neighbor-status signal indicating that the other starter is operational; and an electric circuit for generating the electrical test signal directed to the first starter to test whether the first starter is inoperable when the switch mechanism is operable in the first position, the electrical test signal including: an electric crank signal communicated to the crank signal interface of the first starter to start the first starter; and an electric status signal (350, 350a, 350b, 360, 360a, 360b, 505) communicated to the starter status signal interface of the first starter, the electric status signal (350, 350a, 350b, 360, 360a, 360b, 505) simulating the neighbor-status signal indicating that the second starter is operational. an electric crank signal communicated to the crank signal interface of the first starter to start the first starter; and an electric status signal (350, 350a, 350b, 360, 360a, 360b, 505) communicated to the starter status signal interface of the first starter, the electric status signal (350, 350a, 350b, 360, 360a, 360b, 505) simulating the neighbor-status signal indicating that the second starter is operational.