Web if you buy the mopar performance electronic ignition system, it comes with extensive instructions, wiring diagrams, and other information. Allows battery voltage from the ignition to flow to the alternator’s field coil during startup. Next, connect the output section of the ignition coil to the spark plug. I'm in need of underdash wiring circuit, diagram for ignition switch to relays i need wire color please if anyone can help #14. Web a chevy 350 tbi wiring diagram is the blueprint for your vehicle's electrical system.