Battery not charging

Came out to the car today to started up the car started just fine but I had the message in the display saying battery not charging and look at the gauge on the dashboard and it truly was not charging. Drove down the street got the RPMs up to normal cruising speed, and the battery started charging came up to a red light , idled for s few mins, battery was still charging. Turn off the car, went into the store, came back out, started the car and receive the message battery not charging. Drove the car for a few blocks battery is in fact charging again. Have any of you guys had this issue? Is it my Alternator?

could be the alternator is taking a dump, but..... that being said: how old is the battery? and have you cleaned up the battery post's and grounds to the firewall or block?
sometimes corrosion can be hidden even if the battery post's look ok it might be a good idea to take them off and clean them up with a wire brush
also most auto parts stores like autozone, O-Reilly's, etc will test your alternator for free but if it's intermittent they may not detect it.
good luck!

I was going to check all the cables... they look clean... but it started pouring down rain again! And then I also remembered, if I do that, I won’t have a radio!! I bought this used and don’t have the code to the radio! If I disconnect the battery, no radio!

Steve Waddington said:

I was going to check all the cables... they look clean... but it started pouring down rain again! And then I also remembered, if I do that, I won’t have a radio!! I bought this used and don’t have the code to the radio! If I disconnect the battery, no radio!

Click to expand...

Either way, you’re gonna lose the radio oncevthe battery dies on you... stuck at the store with dead battery and no radio or clean grounds, clean cables, new battery and no radio.... easy choice for me. Pretty much any dealer or stereo shop can get around the code anyway..

What's the charge voltage at time of message? Check with a multi meter both at alt, from charge stud to casing, and at the battery, from positive to negative cables.

If note: the cables on these trucks sometimes like to corrode internally and due to the design of the cable, you can't tell from a quick glance. The insulation and connectors look fine but the inside's a mess!

You shouldn't need a code. If it's the original radio, as long as the Vin matches its memory there shouldn't be a problem.

Started the Tahoe this afternoon. Was like nothing ever happened. No message, the gauge showed charging at 14, so I figured we’re ok for now. Went to the first gig, no problem, packed up and was driving to the second gig, and “ battery not charging”, the icon red light was on the dash and the gauge was almost on zero... dash light flickers, I pulled over to the curb and... dead! Waited almost two hours for AAA flatbed, got it home, switched gear to g/f’s car and made it up the 2nd gig just in the nick Of time!
Ok.. so now back home and looking at auto zone website, new Duralast Gold, 145 amp and new, not Reman, part DLG1923-16-4. Says it fits my Tahoe.
The AC Delcos are all Reman.
What do you guys think? New vs Reman?Might need a new battery now too.

Duralast Gold 145 Brand New vs remanufactured ACDelco? Any thoughts/experiences!

Is a new ac Delco unit on the table? They're only 130 on amazon

A NEW AGM is $160 from rockauto I think they have the best price, autozone probably has one local for $180 plus a core