I installed a GM alternator following the instructions in the archive
and it keeps blowing out my main fusible link as soon as I hook up the battery. I hooked up the lowest pin S to the battery terminal on the alternator and the L wire from the lower original connector to the second from the top pin (L). Then I hooked up the original power wire to the terminal on the alternator. Was I supposed to run a brand new wire directly from the battery to the alternator terminal? What am I doing wrong here??

 

I think your output wire is shorting out against the body of the alt. Try to put a plastc/nylon washer to space the terminal out and to insulate from the alt body.

 

Alot of Alternator swap info is On here.I Hate sayin to search but if I remembered what it was I would have posted the Thread.https://www.rx7club.com/search.php?searchid=2076718 This I found under GM alt swap.I would check to make sure that the connections are Correct because it sounds like a dead short,But the Info I posted for ya may have something to show ..best of Luck.misterstyx69

 

also try hooking the power out put on the alt straight to the bat+

my gm alt was charging discharging all over the place till i hooked that wire to the bat just tape up the old one let it lose:0

 

After i unhooked everything to check if it would still blow the fusible link, my fuel pump wasn't working and i couldnt pull the choke out..Its been a while since ive started the car so maybe its not related, but could I have fried a bunch of stuff before the link burned up??



Yea, i thought so too after looking at the picture closely but i double checked it, and insulated everything so that wasn't the case.



I guess I will try this.

 

if it had earthed for a while it could fry stuff
usally blow the fuse before anything goes wrong

 

what do you mean by "earthed"?


And i tried hooking up a wire straight from the alt terminal to B+ terminal, and it started sparking pretty bad as soon as i touched it to the battery so i didnt even leave it on...

 

Do you have a multimeter or continuity tester? I would check for continuity between the output terminal and ground. I still think the problem is there (or the S terminal connection is grounding out). The connection from the battery goes:

battery==>main link==>Alt out/fuse box

If the alt wire is shorted, you will blow that link. What year is the car? Check out the fuses in the car to see if any are blown. Check the engine fuse, fuel pump fuse, etc. Also, make sure you didn't connect the battery backwards. Hopefully nothing is damaged.

 

Yes i have a multimeter so ill check that. I have an 81, but i think the fusebox was rewired...nothing is labled and doesnt match up to the positions they are supposed to be according to the manuals.

 

No continuity between the output terminal and ground...

 

Hmm. Check continuity between the S terminal and ground. It really sounds like a short. And "earthed"=grounded. He is from New Zealand. NZ, Australia, UK.. will often use the term earth instead of ground.

Did this problem just come up with the alt install or could the problem have been there? Are you sure the battery cables are not backwards? Another thinbg to try is to disconnect the alt output, the S terminal, the L terminal and seeif the fuse doesn't blow. If it doesn't you know the problem is in the connections to the alt. Reinstall the L, then the S, then the output. Should help to narrow down the problem.

 

i got caught im a kiwi


if you hooked the bat terminal from the alt to the positive on the bat and got sparks you defintley have an earth a faulty alt maybe its free to get them checked at like autozone or any other store

heres how myn is...