An electrical system for an outboard engine has a generator, a starter motor, a connector having first, second and third connector terminals, the first connector terminal being connected to the generator, the second connector terminal being connected to the starter motor, and the third connector terminal being connected to ground, and a cap connected to the connector. The cap has a first cap terminal connected to the first connector terminal and a second cap terminal connected to the second connector terminal. The first cap terminal is connected to the second cap terminal. An electrical system having a battery connected to the connector instead of the cap is also disclosed. An outboard engine having the system is also disclosed.