Wiring Tips - how-to-build-hotrods Just look at the other articles in our 'Hot Rod Wiring' section for diagrams and how-to's. 6. Don't add to existing circuits in the fuse panel! As the saying goes, you're never done with a car until you sell it or die. Whether changing or adding to them, people often want to add components to existing circuits. Return from Wiring Tips to Roda Deaco Roda Deaco is the primary supplier of positive air shut off valves and accessories—also known as ASOV (air shut off valves) or ESD (emergency shutdown valves)—designed to prevent diesel engine runaway.