If you are on this page you clearly are ready to let your inner wire geekrun loose. The Auxiliary harnesses are the very most raw elements of the HolleyECU, allowing you to tap into the limits of the ECU's capability. Let us giveyou a rundown of what we have here:
J1A/B Connector Harness (Unterminated): Connects to J1A and J1B (any Holley ECU.) This is where the Main Harness normally connects so either you are about to create your own complete main harness from scratch or you are looking at the wrong harness.
J2A Connector Harness (Unterminated): The J2A port holds the majority of the user-programmable inputs (Dominator and Dominator variant of the Terminator ECU only.)
J2B Connector Harness (Unterminated): The J2B port holds the majority of the user-programmable outputs (Dominator and Dominator variant of the Terminator ECU only.)
J3 Connector Harness (Unterminated): J3 is where a drive-by-wire harness or Multi-Map harness would connect, or you can buy this and aceess additional user-programmable inputs and outputs here. (Dominator and Dominator variant of the Terminator ECU only.)
J4 Connector Harness (Unterminated): J4 is where the transmission control harness would connect, or you can buy this and access additional user-programmable inputs and outputs here. (Dominator and Dominator variant of the Terminator ECU only.)
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