Big electrical problem with my new 2025 3500

[mkresser]

Is Brutal-HO talking about using a Battery Jumper Box to jump start the truck or is his comment meant for charging the battery overnight or for a few hours?

Pretty sure he was talking about charging. If you go right to the post, the computer doesn't know that you have charged the battery and I assume may not realize that the battery is now topped off. I would assume a temporary connection like a jump box wouldn't matter as you aren't affecting the charge of the battery.

After he told me about grounds, I just went all over the truck checking the best I could to make sure that BOTH ends of the grounds from the negative side of the batteries and also from the inner fenders where tight. I got lucky and found a loose ground pretty quickly at the negative side of the primary battery. Tightening that fixed all the starting and PCM/ECM issues I was having.

 

[Scubaz66]

Pretty sure he was talking about charging. If you go right to the post, the computer doesn't know that you have charged the battery and I assume may not realize that the battery is now topped off. I would assume a temporary connection like a jump box wouldn't matter as you aren't affecting the charge of the battery.

After he told me about grounds, I just went all over the truck checking the best I could to make sure that BOTH ends of the grounds from the negative side of the batteries and also from the inner fenders where tight. I got lucky and found a loose ground pretty quickly at the negative side of the primary battery. Tightening that fixed all the starting and PCM/ECM issues I was having.

Thanks mkresser

I’ll do some checking around the fenders to see if I can find any loose connections.

As far as the battery charging I don’t understand why the COMPUTER can’t see a charged battery if it is charged via the battery posts. In this scenario if I removed a dead battery and replaced it with a new fully charged battery then the COMPUTER would only recognize the original dead battery. Has the manufacturers incorporated a specific step that has to be completed before the COMPUTER can recognize the new fully charged battery? We all understand the manufacturers are working desperately to end all the backyard mechanics.

Have a great day!

 

[mkresser]

Thanks mkresser

I’ll do some checking around the fenders to see if I can find any loose connections.

As far as the battery charging I don’t understand why the COMPUTER can’t see a charged battery if it is charged via the battery posts. In this scenario if I removed a dead battery and replaced it with a new fully charged battery then the COMPUTER would only recognize the original dead battery. Has the manufacturers incorporated a specific step that has to be completed before the COMPUTER can recognize the new fully charged battery? We all understand the manufacturers are working desperately to end all the backyard mechanics.

Have a great day!

Folks who know a lot more then me can answer, but I think you are basically correct. When you put a brand new battery in the truck, it indeed takes time for the computer to figure out how much voltage goes in and out of the battery before it actually knows that it has a new battery. Something like that anyway...all I know is that a computer indeed tracks charge and draw through that IBS and then does something with it!