Help with alternator wiring harness

[Taythegoat]

Hey everyone . So I have a 2000 gmc Yukon Denali 5.7 l vortec motor . Recently changed alternator and wanted to change the alternator wiring harness . The harness currently on there is one terminal with only L wire but is a rectangle connector. I can’t find anything on how the new one could be wired as it has 3 terminals in SFL. I can’t find any new wiring harnesses that look like what is currently on my truck . Any insights would be helpful ( nvm resolved question on my own unsure how to delete )

 

[adriver]

Someone may answer, but this website is for a different model. In 2000, there were OBS SUVs and NBS SUVs. This website is for the later NBS. You have the 2000 Classic, OBS body style if you have a 5.7L motor. I would suggest finding a website for OBS vehicles.

 

[Fless]

Someone may answer, but this website is for a different model. In 2000, there were OBS SUVs and NBS SUVs. This website is for the later NBS. You have the 2000 Classic, OBS body style if you have a 5.7L motor. I would suggest finding a website for OBS vehicles.

Moved this to the OBS section.

 

[exp500]

It's very possible your alternator was rebuilt into becoming a "one wire" alternator. A test or rebuild of former alt best option.

If you have Fixed the problem, EDIT Title line. Add SOLVED, Thanks.