Here's a good source for the wiring standard. You'll notice there's more than on 7 pin standard. I believe you will find a switch in the engine bay for 3 lights or 2 lights that combines stop and turn or not. You may also have a 6 pin connector.
Also keep in mind that some previous owner may have changed the wiring for their own use not realizing the standard would likely support their needs anyway. The bottom line is to bring a meter of 7 pin tester before plugging in your towed vehicle.
https://www.etrailer.com/faq-wiring.aspx
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