I bought Leroy's manual glow plug relay and a switch with a "supply volts", "ON ACC", and "Ground." How do I hook this up? I have a 12 ga wire with in-line fuse going from a constant 12 volt source to the "supply volts" hook-up on the switch. I have an 18ga wire for the "ground". And I have an 18ga wire going from the ON ACC hook-up on the switch to the mini terminal on Leroy's relay. Is this right?