Heck, my middle name isn't even Alan. Bu I do have some questions for Atomarc, Waldo53, and Carolines truck. 1. If you run two relays for the reasons given and one does fail for whatever reason. How ya gonna tell? 2. Instead of running two relays, one for you to turn on and one for the heat sensor to operate, why don't you just run the "brains" or switch and sensor in parallel to one relay. 3. Fuses vs. fusable links. Blown fuses a a lot easier to trouble shoot. Fuses are generally located in a central location. There're easy to replace on the side of the road. A lot of guys don't carry VOM's or DVM's in their tool boxes. So why would you want a fusable link in this situation instead of a lowly fuse?
