I saw the need for something that can alert drivers in situations where they might not immediately see a dangerous situation. Also having the ability to shut off power to batteries, electric fuel pumps, or activate additional lights.
My first idea was an optical system to alert to actual flames. I couldn't find a reliable and affordable option. The only cost-effective option I found wasn't sensitive enough. Reliable systems like the ones used in military vehicles are cost prohibitive for the common racer. I heard about the use of Linear Heat Detection Cable by land speed racing. Not the response time of optical sensors but cost effective and reliable.
After searching, I've put together a system I believe is both cost effective and reliable. I didn't invent or create anything new. It's composed of commonly available reliable components. Racers can purchase our heat detector without searching for the right components themselves. Connect ground and power to the control box and two wires to the heat detection cable. The control box contains an extremely bright red flashing LED and 15-amp output. The output can be used for additional lights or controlling components such as batteries and fuel pumps.
When an overtempt condition occurs, the heat detection wire covering melts completing the circuit. The sensor cable consists of two twisted spring steel wires coated with a polymer coating designed to melt at a pre-determined temperature. No delicate sensors to damage in a harsh environment. The sealed control box consists of solid-state components for reliability.