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Do the front marker lights work like they should?
The only thing I see here that would affect only the rears would be fuse #40 in the fuse box inside the truck. The parking and tail lamp relay should be working if the fronts are working, but it splits the power to two fuses, one for the front and one for the rear, the rears being that fuse #40. It's only a small 10 amp fuse so it's possible it's blown. If the fuse is good, then you will need to take a test light and check the fuse for power. If it's not getting power then the issue is likely the body control module. If it is getting power, then you do have a broken connection somewhere along the line.
Please check it and let me know.
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Did you check the fuse? It's possible it was loose in there or just a bit corroded. I would say if they go out again you may have an issue with the body control module going on here. This would have to be replaced by the dealer because it would need to be reprogrammed. You know, it's the fuse box as well in there, you might want to just wiggle the wiring harness at the fuse box to see if it's a loose wire back there as well.
Long as the fronts are working it's got to be happening in the box or with the wiring right out of the box