An engine needs fuel, spark, air to start. It also needs to be properly timed. Are you getting fuel to the engine cylinder? Have you pulled a plug and checked for spark when turning the engine over? Do you have the Renegade owners manual? I would check for fuel and spark to the cylinder before I proceeded to an issue with parts such as a relay or ? Check for proper fuel pressure as well. Many pumps may fit but proper fuel pressure is key to these engines running properly. Electronic issues seem to be a key issue with trooper. The original equipment electronic connections get corrosions easily and need to be cleaned with a wire brush and non-conductive contact cleaner or electronics cleaner. I just finished cleaning all of the gauges, switches, and other connections on my T2. Makes a big difference. If your Joyner has been sitting, corrosion is going to be an issue. Check and clean those connections. If you go to the Joyner USA website you will find a link to download a manual for the renegade. There are some good diagrams for electrical parts. The unit also has an engine relay in the fuse panel.