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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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