ZZCSZ LS Standalone Wiring Harness 4.8 5.3 6.0 Compatible with 1999-2006 GM Vortec Engines 4L60E with Adapter Transmissions Complete Wire Harness for Fuel Injection System DBC Engine Harness

Harness went in without an issue, was too long for my application, but that is a good thing honestly. It could swap into just about anything.Felt like good quality, no need to spend $800 for an equivalent harness. Started right up today without a single issue.$80 harness $20 junkyard ecu, $50 base tune, car was running right away.Only complaint actually is the fuel pump relay situation, it’s only half wired. The instructions cover that but, mine didn’t have the connectors. It would be nice if there was a better solution there, but not a big enough issue to take a star away. Will definitely continue to order this harness for my swaps.

Please note this harness includes injector connectors for EV1 injectors … NOT Multec 2 injectors , as on my 99 Silverado with 5.3 .So you need to adapt

Have a 95 Chevy k1500 installed 2003 ls 5.3 last year. Ran fine but used original wiring harness. Had extra money decided to purchase the stand alone wiring harness to clean up the wires. First the injector connectors was wrong. The o2srnsors was wrong had female plugs on both ends on harness side an I noticed the female adapter checked original harness it was male connector so I cut them off an soldered onto new harness after that everything was in place fuel pump won’t start an end won’t start has very poor instructions an even worst tech support realizing I should of left harness along if not broke don’t fix it

Car started up without any drama, totally surprised, was expecting a fight

Had to repin ecu pins on blue and red connectors and add extra wire in pin 75 red side connector and jump to pin 19 red side connector but other than moving the pins using youtubes help , harness performs good . Recommend buying if youre on a budget but you will have to repin. So far after 5 months I have no problems