PLEASE HELP charging @ 11.8
 

i put a new battery in and new alternator in my 04 H2 I see that theres been these problems on here but nobody comments on the fix. Everything on my truck works just the dis says battery not charging and battery light is on can someone PLEASE help going crazy and broke here

In this case then I'd suspect there is a bad connection somewhere. My guess is one of the multitude of grounds is corroded or loose and its is one of the engine ones.

This post has a PDF of all the schematics..... VERY good document to have as it gives you the details of the entire electrical system, wire colors, notes where things are, etc.
https://www.hummerforums.com/forum/h...68/#post352570

Below are the various chassis ground locations.

There are like 3 or 4 different ones that attach to the engine. I think two at the upper part of the back of the engine and one on each side towards the front of the block.
Forward one drivers side on the frame for forward lighting.
One behind the driver kick panel.
One behind the driver kick panel.
Frame under drivers door.
Under passenger seat on the floor.
About a foot up on the inside of the driver side B pillar.
About a foot up on the inside of the passenger side B pillar.
On both the driver and passenger side body mounts brackets that are welded to the frame (all four of them have grounds bolted to them).
Back wall on passenger side about midway up.

thank you so much for the info I'll be taking it up to our shop and through it over the pit just waiting for the sun to clear the mountains -15 right now lil cold I'll post what I find

thanks again

Yeah - I'd not be working in that cold either. lol

Sounds like you might have got a bad replacement alternator ...

FIXED so i brought back the alternator asked for a new 1 the only other thing i did different was i wire brushed the alt bracket put in the new alternator and the truck came alive thank you so much for the help guys thank you mixManSC for the pdf file I learned a ton looking over all of that I'll be hitting walmart tomorrow to get it all printed out. thank you TeeStu I thought about bringing back the alternator thought it cant be bad then see your post and figured i'll bring it back just to rule it out and that was it
THANK YOU MEN

Excellent! I should have mentioned that myself as well. Test the alternator directly with a multimeter while it is running to see what it is really putting out or just swap it.