This nitro programmable ignition system apply for Harley Davidson. Here you will find detail information about the nitro programmable ignition wiring and connector description and function, e.g. the power leads are the two heavy 12 gauge wires and are responsible for getting direct battery voltage to the ignition. The Ignition is load protected from reverse battery connections and will automatically shut down if there is over 27 volts input (note: do not connect to batteries over 16 volts).
The CDI unit has 2 wires Heavy Red which connects directly to the battery positive (+) terminal or a positive battery junction such as the starter solenoid. Minimum 10V to Maximum, and Heavy Black which connects to a good ground, either at the battery negative (-) terminal or to the engine. The red wire in the ignition switch is responsible for turning the Nitro-Harley Ignition On and Off as well as supplying power to the triggers. Connect to a switched 12 volt source such as the ignition key or switch. Also recommended for lanyards.
Find more information about Harley Davidson Nitro Programmable Ignition System and its wiring diagram in the following article on page 7 – 12. (source: msdpowersport.com)