Sometimes they switched the center position as battery function with a backup light function. Since you'll need to have a breakaway battery anyway, you really should scrap the 6 prong and install a 7 anyway.

Cautionary tale: I really screwed up recently. I had a similar trailer that had the brake wires switched. Kept blowing fuses. Being in a hurry as usual, and no more fuses I used a piece of wire instead as a fuse. Ended up frying the entire truck-side wire harness. It was all one melted piece of plastic and wires. No one had one and the dealer said there were 28 on backorder--and may never be built anyway. So I removed the burned one and hand made a new one--on my living room floor. Took 14 hours. And lost more hair trying to figure out why I had redundant wires left over. But it works now.

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