go4lucas

I replaced my alternator a while back and ever since i've been having this battery not charging issue when i start the car. The battery light will come on in the dash but as soon as i start driving or rev up it goes away and the battery charges. After that initial battery not charging message I can idle the car and the battery will remain charging. I am getting codes P1637 and P0622. I thought maybe it was the alternator pulley but I compared it with the one i pulled out and its the same.

vroom_vroom

iTrader: (5)

Is it the ls6, I remember reading a post before where you have to replace it with a very specific one not a parts store one.

jmilz28

iTrader: (13)

http://www.engine-codes.com/p0622.html

jmilz28

iTrader: (13)

http://www.autocodes.com/p1637_cadillac.html

go4lucas

Yeah its an ls6, thats a shame i'm not going to be buying another alternator lol I guess i will just disable the codes

MarkFJ40

With mine it was the diode bridge in the alt causing P1637. It eventually cooked the battery to the point where it wouldn't hold a charge.

NIKDSC5

iTrader: (10)

My bet is the wire going into the alternator is loose. That's what mine did. Had to get in there with a pick and bend it to make better contact.

demang

iTrader: (3)

If you bought a non gm oem it's the alternator. Its a very common problem when you get a parts store alternator. The only fix i've seen is getting the gm oem.

go4lucas

Yeah its def that. I bought my alternator on amazon and i know its not oem

MN_V

iTrader: (5)

I had to do the exact same thing after I kept getting intermittent not charging DIC messages from 2 new AC Delco units. Checked the continuity to the ECU and both wires were perfect. Bent the pins from the alternator since they're so skinny and never have gotten the message again.