I am restoring two 1970 Boss 302s. I have discovered that one of them has a relay (see photo) mounted on the body just above the passenger side vent, while the other does not. My wiring diagram does not show this relay (I assume it is a relay). Does anyone know what this may be? I have included a photo of the relay. It is wired through the stock wiring harness so it does not appear to be aftermarket. Thanks for any Help