[19trax95]

So it blows the fuse whether there's a trailer hooked up or not correct?

That would indicate to me that there is an issue on the truck side. Likely a short in that circuit. Start easy with all the plugs along the harness. Inspect for damage or stuff that simply doesn't look right.

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[19trax95]

Should just twist out of its holder then the plug goes into the back of the larger body of the actual trailer plug.

At least that's how my 01 is. I can't say I've needed to take one apart on a newer truck yet so unless you have a 99-07, my answer may or may not apply