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-   5.0L (1979-1995) Mustang (https://mustangforums.com/forum/5-0l-1979-1995-mustang-14/)
-   -   Still not charging enough (https://mustangforums.com/forum/5-0l-1979-1995-mustang/194735-still-not-charging-enough.html)

PJB 10-18-2006 11:12 PM
Still not charging enough
 
I just got done putting on a 130 amp alternator from a '95 Mustang 5.0 and my car still doesnt charge enough at idle with the lights on.
Ive got underdrive pullies and had a charging issue with them and the stock 75 amp alternator so I got a higher amp alternator and wired it up the right way (used a link in this forum) and now still have a charging issue.

I dont have a big stereo or anything else electric to draw away alot of power so whats the deal here?

The gauge reads between the A and L of NORMAL.

What do I need to do to make this thing charge right?

lookin4astang 10-18-2006 11:13 PM
RE: Still not charging enough
 
What is your idle speed? Did you check the threads below this one?

black89gt 10-18-2006 11:23 PM
RE: Still not charging enough
 
take the underdrives out and your problems will be solved.

7upedition 10-18-2006 11:26 PM
RE: Still not charging enough
 
have you tested the alternator and battery with a load tester to see how many amps/volts your drawing vs. putting out?

and yes i've heard underdrive pullies can cause charging issues...[&:]

PJB 10-18-2006 11:44 PM
RE: Still not charging enough
 

ORIGINAL: lookin4astang

What is your idle speed? Did you check the threads below this one?
Idle speed is around 900 rpm

PJB 10-18-2006 11:44 PM
RE: Still not charging enough
 

ORIGINAL: black89gt

take the underdrives out and your problems will be solved.
But I like the power increase from them. Also I just bought them 3 weeks ago.

PJB 10-18-2006 11:47 PM
RE: Still not charging enough
 

ORIGINAL: 7upedition

have you tested the alternator and battery with a load tester to see how many amps/volts your drawing vs. putting out?

and yes i've heard underdrive pullies can cause charging issues...[&:]
No, I dont have a load tester and I didnt finish the installation until after 9 tonight.
I know the underdrives cause a charging issue but I thought that was only with the stock 75 amp alternator and I thought the 130 amp alternator was supposed to make it ok. Thats the whole reason I bought the 130 amp alternator.

r.barn 10-18-2006 11:49 PM
RE: Still not charging enough
 
you need a smaller alternator pulley to speed up the alternator.
I was lucky and had a buddy with one laying around, not sure what it came off of.

and I thought the SN95's came stock with a 130amp alt? No?

PJB 10-18-2006 11:51 PM
RE: Still not charging enough
 

ORIGINAL: r.barn

you need a smaller alternator pulley to speed up the alternator.
I was lucky and had a buddy with one laying around, not sure what it came off of.

and I thought the SN95's came stock with a 130amp alt? No?
My car is a '92.

I have a pulley off the '92 alternator, one off the '95 alternator and the underdrive one. Should I just find the smallest one and use it?

7upedition 10-18-2006 11:52 PM
RE: Still not charging enough
 
yes, '95's came with the 130amp alternator and smaller pully


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