There is a short to ground either in the wire leading from fuse #28, which provides power to the speed control servo, or an internal short to ground in the speed control servo. Fuse are designed to blow when a short to ground happens because of Ohm's Law which governs electricity. If you have a constant (vehicle battery 12V) then if resistance or current go down(resistance goes to 0) than the other(current) must go up(current to infinity). When the current is more than the fuse can handle, it blows, saving a fire from happening. In the diagrams down below I have included a wiring diagram of your vehicle's Cruise Control circuit as well as instructions for tracking down a short to ground. Please go through these guides and get back to us with what you are able to find out.
Images (Click to enlarge)
Sunday, June 23rd, 2019 AT 12:14 PM