Start-stop retrofit systems and methods

A method, comprising:

• delivering an activation signal from an ignition interface of a vehicle to a starter motor of the vehicle via a first pathway to activate an engine of a vehicle;
• delivering a deactivation signal when a processor of a start-stop module determines that the engine is idling, or a brake of the vehicle is applied, or a combination thereof;
• and
• delivering a reactivation signal from the ignition interface to the starter motor via a second pathway that is separate from the first pathway to reactivate the deactivated engine when the processor of the start-stop module determines that the brake of the vehicle is released, a transmission of the vehicle is not engaged, or a parameter of a battery of the vehicle is beyond a threshold value, or a combination thereof.

A method of retrofitting a vehicle with a start-stop module that includes a wire harness, comprising:

• plugging an on-board diagnostics II (OBDII) connector of the wire harness into an OBDII port of an engine control unit;
• plugging a brake light connector of the wire harness into a brake light interface of the vehicle;
• plugging an ignition interface connector of the wire harness into an ignition interface of the vehicle;
• plugging a starter motor connector of the wire harness into a starter motor of the vehicle, wherein the ignition interface connector and the starter motor connector of the wire harness are directly connected to one another via a first pathway and are separated by a switch via a second pathway, wherein the switch is communicatively coupled to the start-stop module and is configured to start and stop the engine of the vehicle based on control signals from the start-stop module;
• and
• plugging a battery sensor connector of the wire harness to a battery sensor of the vehicle.