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That is usually a tripped shortstop breaker up near the battery. By code, they have to be located within 18" of the battery. I will attach a photo link so you can see what they look like. Small black button on the end that you push in to reset it. Some OEMs put in a fuse instead. That may be a blade fuse or cylinder style fuse. In any event, it is keeping the battery from powering up the lights. The slideout has one as well and that one isn't tripped. If you don't see it, follow the positive lead to it and it may be located underneath and even behind a small cover on the bottom side that is accessed by removing some screws. Hope this proves helpful here. Please get back to me if you need more as all follow ups are included in our fee and fully expected. https://www.bing.com/images/search?view=detailV2&ccid=BqT81%2fi2&id=8D4939A7F0965679E3E29C89B963B0D9C24CDC15&thid=OIP.BqT81_i2snOEu0WIlAltMAEsEY&q=shortstop+breaker+photo&simid=608020010253748560&selectedIndex=1
If you are still having issues we can do some quick testing with either a 12 VDC test light or small digital multimeter. About $5 and $20 or so respectively and easy to use.
The amperage won't be more than 30 amps and you can gauge them by the wire sizes. If any are larger than the wires for the 20 amp breaker, then use a 30 amp. A photo of the wiring would be helpful here. Attach it using the paperclip icon if you can.
Good job on the photo! And you are most welcome! The two with the black wires ONLY should be 20 amp and the one using the red wires should be 30 amp. Copper post goes TOWARDS the power supply. Direction of power flow goes TOWARDS the silver post. Hope that gets the job done. Replace any terminals with a lot of corrosion between the wiring and the ring terminal. Southwire makes a nice stripper and crimper. Let me know if you need more here.
Black lead off the tow cord is the charge lead from the tow vehicle. It would be fused in that vehicle also.
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