Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit 2019 Jeep Cherokee - Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit. Diode kit allows you to use your Jeep Cherokee's tail lights and wiring system while preventing feedback from your RV. Wires 2-wire and 3-wire systems to operate as a combined lighting systems. Includes 7-wire to 6-wire Flexo-Coil electrical cord. Features:4.8/5(104)Category: Tow Bar WiringBrand: Roadmaster Jeep Ignition Coil - How to test for spark, signal and Jeep Ignition Coil test is one of those test you really need to know. It can save you lots of headache and money knowing how to do it. You don't need any fancy tools to test a Jeep ignition coil. All you need is a simple multi-meter and a 12-volt test light.