First off, diesel pickups simply run two batteries in parallel to give more starting capacity...electrically its exactly the same as one battery with twice the capacity.
The trailer charge line normally goes to pin # 4. Simple to check, it should be hot when the engine is running and not when you shut the key off. None of the other lines are hot except when a light or the brakes is active.
The factory charging circuit should have a fuse installed. On my '99, its one of the large fuses under the hood. Look at the list of fuses in the manual, it'll list one for charging a trailer battery, or some similar term.
Here's another link to a site showing the "standard" connections. I checked my travel trailer, & sure enough the battery charge circuit is on pin 4, not on the aux terminal. If you're not going to use your trailer on another vehicle, or tow someone else's trailer, it really doesn't matter.
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Today's Featured Article - Show Coverage: Argyle and Mt. Pleasant Labor Day Weekend Shows - by Cindy Ladage. The last fling before summer fades into fall and we get busy in the fields are the annual Labor Day tractor shows. Beginning on September 5th and running through the 7th, the Argyle Antique Gas and Engine Show is held at the Argyle State Park. Located in West Central Illinois, the pine forest was the setting for the opening of the 22nd show. This year we decided to try to sell a few tractor parts, literature and wrenches to offset my husband's buying sprees. Saturday
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