Hey all before i get bashed and recieve the search prompt.... I have been searching in this board for like 4 days for alt wiring information. None of the info that i have found pertains to my question specifically.
With that said...I am in the process of swapping my 2.8 out of my 85 firebird. I bought a 305 tbi eng out of a 92 formula with intentions to take the serp. setup off to put on my 350. The v6 alternator that was in the car has a 2 blade type connector with a stud on the back of the alternator. The alternator that came off of the 305 has a 4 pin type connector with a stud on the back for 12v. The connector did not come with the engine mind you. On thursday i ordered the connector from a local ac delco supplier. They sent me a connector that has four unlabeled white wires three like 16 gage and one like 12 gage coming out of it. The connector fits perfectly but i am stumped as far as how to hook these up to what. ANY and all help would be greatly appreciated. -Bob

 

Im actually doing the same swap, at least altenator wise, on my '85. Tomorrow I am going to have a friend of mine (and electrical engineer graduating from UM) check my diagrams. Hopefully, I have it more or less right. From what I gather from examining the wiring diagrams from an '85 TA and a '90 fullsize pickup, you wont be using all those wires from the weatherpack. If I dont blow anything up and it actually charges the battery, I'll let you know how I did it tomorrow night.

 

Thank you Sainted, i appreciate any help that you can give. -Bob

 

Wow!! That was quite possible the most grogeous tragedy I have ever witnessed! Well, I dont think I wired it right. The altenator made the most beautiful shade of purple light. Then it blew the positive terminal off the battery. Hopefully it didnt melt the computer.

A word of advice: when getting advice from electrical engineer students, make sure you find out what their grades were.

 

y not use the existing alt on the new motor and then use the same wires, or was there not a surp pully on the alt u where using, im planning on doing a carbed v-8 swap, and im going to just reuse my current alt so that i dont have to fab up a new charging system.

 

The alt that was on my V6 has a different case than that of the serpintine V8 alternator. I already tried it, it will not work, you cannot use the V6 vbelt alternator with the serpintine V8 setup. -Bob

 

Alrighty! Here's how you do it: I finally got it running and charging correctly. You will only be using one wire from the plug that goes in the side. In the pack, there will be either two or three small wires about 16 gauge or so (mine only had two, but there was a space on the outside for another). You will only need the one in the middle (on my plug it was brown.) Ignore the other two (or one) small wires and the larger red one as well; you will not need them. This small wire needs to be spliced into the smaller gauged wire connecting to your two prong plug from the wiring harness in the car, which my wiring diagram says goes to the instrument panel. I believe the one from the car is also a brown wire.

Next, you will need to locate the heavier gauge wire coming directly from the positive terminal of the battery. This will need to be connnected to the 12V stud on the back of the altenator. It should have been connected to the 12V stud on your old Alt.

Finally, there was a ground wire bolted to the bracket your altenator was originally on (two wires into one star looking thingy that grounds stuff. Probably brown and black wires). This will need to be grounded in the back of the altenator via a the ground in the back of the altenator.



To recap simply:
1. Middle small wire in connector to small brown wire from original harness.
2. 12V stud to positive battery terminal
3. Ground wire to altenator case

Hope this helps. If I had a digital camera or a scanner, I'd send you a picture, but I'm a poor college student. E-mail me if you have any questions at SaintedCorrupt@aol.com

 

No when you say "middle wire" do you mean the one immedietly next to the thicker of the three wires? That is how i understood your response anyway. Thank you, i will be doing this tonight after work hopefully it will be running this weekend! - Bob

 

No, its not the one right next to the thicker wire. Starting from the larger wire and lableing it #1, you would be using #3 down the line. If we were excluding the large wire, it would be the middle of the three smaller wires. Or the last one on the end if your plug only has two small wires. Sorry for the confusion.
-Corrupted