Need help with alternator

[Khost26]

Ok so i swapped my s13 with an s13 blacktop and i thought my alternator wasn't working so i took it out and put an kade one in. I turned it on and still wasn't working. I tested the volts at the battery and it was 11.9 and going down. I checked the fuse and it was fine. But i took it out while it was running and it didn't effect anything the alternator has all 3 plugs in. Does anyone know what this could be?I really cant figure out where i might be missing something.Thanks

[fastass]

i had a similar problem with my toyota pickup. idk what wire it was but there was a wire, that was bad and i rerouted by splicing it and running it into the cab, into the fuse box.

[zerepdivad]

Did you ground the alternator casing?

[Khost26]

Did you ground the alternator casing?

yeah i did. Any other ideas?

[zerepdivad]

75 amp alternator fuse?

[Khost26]

75 amp alternator fuse?

yeah i checked that too. i really have no idea.

[zerepdivad]

What are you getting for voltage right at the positive terminal on the alternator that goes to your battery?