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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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