Alternator help!!!
 

Can i use a 77 chevy c10 alternator on my 65 c10 on the 350 i just dropped in it. Isint it a internallly regulated? And the one on the 65 with a 230 a externally regulated? How can i do the conversion with out burning up all my wires?? Dont have old alternator anymore that came off the 6.

Re: Alternator help!!!
 

Jason,see if you can get this moved to electrical section! If you google your ? you can find lots of posts on this

Re: Alternator help!!!
 

Save yourself a headache and get a "one wire" alternator for your truck. No external regulator needed. Its a sweet thing!!

Re: Alternator help!!!
 

I definately agree on the one wire- just make sure to get one that is a low rpm start up- some of the cheaper alternators will not charge if the alternator goes below 1200 rpm-NOT engine rpm, alt rpm which is usually about twice-depending on pulley combination.

Re: Alternator help!!!
 

Jason,

Hooking up one of those 70's GM alt is easy. By Your post it seems like you swapped a 350 from a 77 truck and want to keep the alt that came with the motor, Right? The only thing you will need is either a 12v test light or better yet a multimeter. The alt that came on the 1977 350 is probably what is called an SI which was the first generation internally reg alt, anyways.

Now how to hook it up. Looking at the back of the alt, there is a stud and then on top there is a place to hook up 2 spade type connectors and if you look closely they're numbered 1 and 2 (1 is the one on the left when looking at the alt form the back). First hook up the big wire to the stud. This wire should be hooked directly to the battery, 12v when engine not running and 14.4v when running. Next using your tester or multimeter find the wire going to the old external regulator that gets 12v when the key is on. This wire will need to go to the "1" terminal on the alt. the "2" I have always hooked to the stud on the back of the alt., although I have read that this is not necessary so maybe try with out and if it doesn’t charge then hook it up as I described.

No need to spend money for another alternator. Although a one wire alt is easy to hook up, I don’t think using a stock internally reg alt is hard to hook up and they are dirt cheap and available at the local auto parts store if a replacement is needed.

Graham

Re: Alternator help!!!
 

http://67-72chevytrucks.com/vboard/s...d.php?t=465260 this should help

Re: Alternator help!!!
 

After a quick read maybe better to hook terminal "2" to the stud on the back. Looks like it might help the alt start charging sooner.. If you have any questions you can ask or google delco si alternater and you will get a wealth of info.

Graham

Re: Alternator help!!!
 

Jason, review the alternator info at www.mad electrical.com. You will see that the newer alternators with internal regulators come in 2 cases, several amperages, and one wire and THREE wire. I prefer 3 wire for better load sensing. This site can help you understand what you need how to go get what YOU need. It might be that a '86 GM car used just what u need!
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Re: Alternator help!!!
 

Well i had a buddy tell me that you can just take the two wires that hook to the plug that plug into the alternator and cut them leaving a little bit of wire sticking out and just twist them together and tape them and then just plug the hot wire to the battery. IDK Will this work??

Re: Alternator help!!!
 

That will leave the field energized all the time, leaving you a dead battery when the truck sits w/engine off. The smaller(usually white)wire on the plug only needs power when key is on.