If your temp switch throws a ground to trigger a fan, it can be used to ground the relay and spin up the fan. You will have a harder hit on the electrical system than with the easy start the factory provided. It should still be under the limits of this relay. The spike would dissipate quickly. It would probably be visible in dimming headlights if your system isn't ultra stable.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
