Ah. According to the online owners manual, the truck has to “see” that there is a trailer attached before it will send power to the 12V+ pin. I guess you could jump both brake/turn pins to ground, turn the truck on, and hold the brakes for a few seconds… That might trick the truck into thinking a trailer is connected? Then you could check for 12V+.
This gets a lot easier with a scan tool. Stupid smart vehicles. They think they are so smart. But they’re not. They are STUPID.
PS- How did you come to the conclusion that the trailer isn’t getting power from the truck? Here’s an easier test… Disconnect the trailer battery, solar, etc and unplug from shore power. Plug the trailer into the truck and make it “recognize” the trailer. Turn on some lights inside the trailer (not towing lights). Do they work? Your truck is sending power to the trailer…
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