Got a gas turbine that was designed with a 12v electrical system. I replaced it with a 7.2v xicoy setup so I got a 40a 220vdc ssr to run the starter off a 12v battery instead of using a regular relay. Using the starter connection from the ecu to drive the ssr. Because the starter, ecu, and glow plug use the engine as a ground I wanted to make sure the wiring is right before I wire it. Using a 30a 200v schottky diode on the motor I think.