Chris, send me your e-mail via PM and I will send the document. The relay you can buy from Alpine Innovations uses the same circuit as I use ( I think they took the idea from my posts) but they put the resistor and diode inside the case which makes it a bit cleaner fit. But my kit of parts includes all the piggyback connectors so you do not need to make any changes at all to the original wiring, while using our own common relay. I think I have attached the document!