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.

I did the YouTube mods and it has worked great for me. Running a 01 6.0 in a mud truck great.

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

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

Product was very well packaged and included all connectors for engine swap! Super easy install once you figure out routing.

Works great haven't had any problems with it

Definitely a great price for a reasonable build budget, highly recommend.

Works great for the price. Just had to extend a few of the wires for my personal needs.

So, I finally decided to give the Amazon special pre-made LS swap wiring harness a try. For all my LS engine builds to date, I would thin out and re-route the stock GM harness, provide a fuse/relay block, and be done. But, TBH, for about $100 CAD I just couldn't pass it up! Here are my thoughts and impressions on the harness pre-engine start. General: - quick delivery, packaged well, no damage - the harness, plastic split looms, sensor connectors and seals, and wires were all new and clean, and defect free. Even the ECU connectors were great. - harness DID NOT come labeled. I added those as needed. - instructions were limited, but with a bit of mind power and reseaech anyone can figure it out. Wiring: - using a multimeter, I rang out all of the ECU pins to each harness sensor. You can find the ECU pinout table at LT1SWAP.COM. - only two (2) sensor connectors were mis-wired. The TPS and MAP. Easy to re-pin. - the grounds to the two (2) relays required swapping. Wrong locations. - ECU Blue pin#75 was not wired. Was wired to pin#19 which is wired to the fuse block. - came with 5- and 3-pin MAF sensor connectors and a connector for an external IAT sensor. Perfect for MAF-less tuned engines. - came with additional wiring for two electric fan signals (wire them yourself), engine light, tach signal, ignition, and others. - came with an OBD2 connector. - has a single 12v wiring that connects to the starter post. - has grounds for the harness, the relays, and the ecu. - needed delphi injector type connectors, which are also sold on Amazon. Not required for everyone's engine harnesses. See pics. Startup - zero issues! What's not to like. Overall - I will likely buy another one for my next ls engine build. - as noted above, I would recommend checking all the wiring prior to startup, but you should do that for any wiring regardless of stock/oem or aftermarket. Thanks

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

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