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I picked up a used 07 350 XL with 7,000 miles over the weekend, but it did not come with an owners manual. It has the integrated brake controller, but I noticed looking under the hood it's missing a few of the relays. I know the XL won't need all of them, but was wondering if anyone can verify which ones control the trailer wiring (if they still do it this way).
It would be nice to know before it gets hooked up to a trailer.