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Hello, I'd be happy to help! First, I see you said you charged the battery, do you have something to test it with, to check for the cranking amps and check what the voltage is? It may sound dumb to ask, but the customers on this site vary in knowledge and experience, I always have to ask the basic things first.
Ok so the horn does work? I'm sorry I'm having trouble with internet so it's hard to get a response in. Did you check the fuses in the high current fuse box? There's a few 100+ fuses in there that could cause a shutdown like this. Also, if I can get the Internet to act right I'll know more, but there's a battery saver relay in the BCM, but I have to see if it's serviceable or integral to the bcm.
Sorry for just now getting back to you, that was according to the power distribution wiring diagrams I was looking at earlier. I'll check again in the morning, I plan on getting to work early so I'll have time to answer some more questions and not be rushed, I will get in touch with you again in the morning and I should have had more time to study that diagram by then. Do you have a multimeter?
Oh boy I'm sorry to hear that, I hope you heal quickly. I know you said the horn did work, is there anything else other than the aux brake control that works? Even the smallest thing so that way I can try to find something shared in those circuits.
Here is the wiring diagram with that high current fuse box I was talking about.
Ok I've been studying that diagram, everything, including the cig lighter is run through the junction box under the hood, with the exception of the horn being run by the bcm, but the bcm receives it's power from that box as well. I would pull the box up and check for wire damage, check the condition of the ground it uses which is listed here left rear engine compartment so it should be close to the box.
Sorry, the BCM is the body control module, it is what controls a lot of accessory components among other things but they vary by vehicle. In your case the bcm also serves as a fuse panel, which is the one you're checking in the cab. It supplies the power for the horn circuit, so it stands to reason it should have 12 volts. The wire coming to the engine compartment fuse box comes from the 200 amp main fuse on another panel, but because that box supplies power to the BCM and the cigar lighter, we know that the wire coming in should have power as well. The grounds I'm talking about are coming out of the bottom of the engine compartment fuse box. With it being this new with such low miles on it I'm beginning to think you may have something like pest damage somewhere, field mice will get into peculiar places and chew wires. They're all separate circuits until they reach the box, but some things powered by that box still work. It's hard to say without being there but that's what it's beginning to sound like.