Holley 558-102 LS1 Main Harness

this is the main wiring harness for Holley Avenger HP or Dominator system this particular harnesses is for a four barrel TBI all the harnesses are similar although this may look complicated it's really pretty simple all the connectors are labeled to tell you what they plug into these are the two connectors that plug into the ECU this loose wire here which is red with a white stripe needs to go to a switch ignition power source this power source must be active when the key is in the run position but also importantly in cranking position if your vehicle won't start first thing to check is to make sure that the source that you connect this wire to has power when the engine is cranking this fuse is for the fuel injectors and fuel pump this relay is for the fuel injectors in the fuel pump this is a canvas wire if you're using the optional Holley full-color touch-screen LCD plug into this por