Aftermarket replacement for John Deere part number RE37651. This wiring harness connects to the 3 terminal convenience plug in the cab of most John Deere tractors produced since the 1990's. The three wire harness allows you to provide a ground, constant power (hot) and a hot feed that is activated only when the switch key switch is on. Ideal for powering monitors, GPS modules, sprayer controllers, etc. This wiring harness has an extra long 3 foot lead.