2020 2500HD (L5P) won't crank after replacing both batteries.
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If your connector also has a big lever to get the connector on and off, you don't want to force the lever either way, as it becomes a bigger problem if you bust the lever or the mechanism it works. -
It's just useful to disconnect the battery to prevent odd shorting out when unplugging/plugging stuff together. I also touch the two cable ends together (after disonnecting) to drain the small amount of stored battery energy in various modules. I believe the main system where you need to be more concerned with, so you need to do the above and then wait some time, iss when you are working on the air bag system, to prevent inadvertent firing of the air bags. The in-cab switches are just that, plain switches, it's generally not a problem to swap them in/out. For my '12, I'll get an error message on the dash if I power up the truck w them unplugged, but that's it (power up= turn the ignition on). The ITBC located above the spare tire is a computer that manages the trailer brake system. That is probably more important to have the battery disconnected. It does have to be programmed to the truck, either before or after it's installed, for it to work. For my '12, I had a very hard time reinstalling the main connector to it (IDK if yours is the same or not), it turned out the silicon seal was jamming up, preventing it from going on all the way. I finally got it fully installed by lubing the seal with a bit of dielectric grease, then it slid on and latched in place easily.
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JR ! I just got the truck back from the Dealership today . The technician did a cold remote start on the truck this morning and it made the noise . It was determined that it was a starter issue and replaced it under warranty . Of course it did not make the sound after a new starter was put in because the truck was not cold . We will we see what happens tomorrow morning when I start the truck cold . Keep tuned ! Oh I found a video on YouTube of a cold start and it did the same thing your truck and mine do , I will see if I can find it and post it up -
Thank you JR ! Here's hoping you can post the video with sound
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By Grumpy Bear · Posted
Looks about right given the data provided. Could it be better? Perhaps. But in spec isn't going to get it that way under warranty.
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