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I tow with a Ford Ranger 4.0L and was thinking some extra momentary current from the batterys was needed to help apply the electric brakes. My ranger didn't come with a factory wiring harness, I had to add it myself. I wired the trailer battery to the truck battery (with a fuse). Maybe I did this incorrectly.
In other words, if I have a dead trailer battery and good truck battery and connect my truck via the 7 pin: after time both batterys would be 50% charged rather than one good and one bad.
I was suspecting the alternator in the truck was working to charge the trailer battery and didn't have enough current left over to fully apply the brakes.
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