great 8

Ok I just put a new alternater on my 86 5.0 and a new battery as well. My alternater won't charge my battery for sum reason. I kno for a fact that its the alternater cuz i just checked to see if the battery was getting a charge from the alternater and there is no charge at all. The alternater is BRAND NEW . Wat could this be and wat should i check ?
Aite thanxz

mattdel

what is your voltage gauge reading?

tmajikman

might be the voltage regulator.

great 8

12.8 wen car is off and 12.4 wen car is runing

great 8

Are u talkin about the voltage regualtor thats mounted on the ALT or is there another 1 dats external that I should look for if there is an external 1 where should I look?

mattdel

sounds like either a bad battery ground or defective alt.

tmajikman

I think there is an external regulator, I just don't remember where it is located, someone help us out.

tmajikman

+1 on what mattdel said about your grounds as well, make sure they are clean and tight, check the battery also with a load tester, at advance or autozone.

settled4automatic

if there's an external voltage regulator, just follow the wires from the alternator to find it.

great 8

So The Alt could be defective even if its brand new i just got the ALT today. Also wat grounds should i check the battery ground and wat other grounds??