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Damn, there was a thread about this not too long ago. I can't remember what they went to, but the majority of the trucks don't have any use for them. I know I have both those connections as well and they are just hanging there.
 

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Did some trolling. Are these for trailer brake controller?
yep,red goes to one of the aux posts and feed power to the brake controller
the blue comes from the brake controller and you need to run a wire to the connector at the rear
 
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