Does anyone happen to know what series of terminals are used in the Underhood Electrical Center? It appears there are three different varieties used.
I am wanting to repurpose one for use in an LS swap, and would rather crimp new wires than splice pigtails.
They're Metri-Pack 280 series for the mini fuses and relays and Metri-Pack 800 series for the Maxi-Fuses. I don't believe my UEC had any other terminals (besides the big brass stud from the battery) - this is on a 1996 Roadmaster Wagon.
It might be worth saving some of the original "bus" terminals and either splice (I know...) or un-crimp/re-crimp your wire on. These terminals have a wide strip with 2, 3, 4 terminals in a row with the proper spacing and one wire crimped on the end. This allows clean wiring from a single power or ground source to multiple fuses or relays. I redid a bunch of stuff on mine, added the 2nd relay for 2nd electric fan, repurposed a couple other relays as well as the fuses, etc.
Another option is to just build your own rather than fighting through a re-purpose. A bare box is at most $25 for a 72 position one and it's sealed. They have 12, 24 and 48 position ones too. You need to buy the terminals anyway, the box is cheap and is (can be if you use wire seals) waterproof unlike the OEM underhood ones. GEP uses the same terminals as GM. Littlefuse do not use the same terminals. They accept the same 280 series relays/fuses, but do not use the same female terminals (been there, done that, have a bunch of GT series terminals for the newer GM connectors
Metripack series commonly used on these 90's GM vehicles - https://fixuntilbroke.files.wordpres...es-section.pdf
Newer GT series terminals used on the newer GM vehicles - https://fixuntilbroke.files.wordpres...es-section.pdf
From the above documents, you should be able to find part numbers and order from wherever you choose - Mouser, DigiKey, Allied, Waytek, Del City, etc...