I am restoring/rebuilding my 2000 Silverado 2500. Some of the wires are broken at the connectors in the door and in various places. I want to buy a Metri-pack kit that I can use to re-do some of the connectors and such. How can I tell which size terminals they are? There are like 4 different kinds and I can't really tell which one is which. Does anyone know?

 

The only thing I can offer is that, if you go to the AC Delco website, and use the catalog there, you can sometimes find many of the connectors listed there.

 

I recently went through s similar problem frying to rewire a e fan harness ( with absolutely no help from anyone on here). What I ended up doing was buying several different connectors from several different sellers and they all had a minimum purchase. The problem was that they only show 1 view and tho the side you see may look right when you get them the side they don't show is different than what you need. That being said here are a couple of the ones I purchased from that may work out for you.
Del city wire
Aptiv connection systems
Good luck

 

You can download some of the Metripack catalogs and other info at the Aptiv (bought out Delphi) website here https://ecat.aptiv.com/

Search for a 280 series connector and look up the datasheet, there may be a full catalog for Metripack available, and you can compare some of the pictures. If you can wait... I might be able to attach some of the catalogs tomorrow, since I downloaded them for reference.

EDIT:
OK I was going to upload but some of these files are to large so I put them on Google Drive

Metripack Catalogs https://drive.google.com/open?id=16j...dxv8IabnsvsTDq
2001 GMC Sierra wiring diagrams https://drive.google.com/open?id=10Y...dTTIHKfL3SkgLM

There is a large compilation of 01 GMC Sierra wiring diagrams in other folder. I got the wiring diagrams from this resource BBB Industries- Premium Alternators, Starters, Power Steering Products | TSB's & Wiring Diagrams They used to have it where anyone could just access the files for download, but now it requires you to fill out that form which I haven't tested but I believe they still give you the file access after you do that. It has wiring lookup for a lot of years, makes, models.