I think my hubby put trailer lights on wrong, and blew brake light switch, we put new bulbs in but not working, we know there is a switch under brake area but not sure where on this truck and how to get to it. PLEASE if anyone knows where it is and how to remove that would be great. We replaced the relay switch also so I think this is our last option.
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Most trailers use a single bulb system with the bright filament used for the brake and turn signal, and the dim one for running light. Your truck, however, has a separate bulb for brakes and turn signal, thus requiring the use of a logic box to operate the trailer lights. Get one from parts store, install and all should be good.
Check at the light socket in the rear, where your lights don't work. You need a test light or a voltage meter, and check to see that you have a groun there, power for your parking light, and power to the brake light. You should have power for the parking lights seeing that it works, and a ground. Just verify that your power for the brakes is getting to the bulb, or not. Just a good place to start.
And you are correct that if the third brake light works (top) your brake light switch is fine.
Is this a 4 way or 6 way connection system? If your truck is wrong, then all factory equipped trailer package harnesses would be wrong, tell your trailer guy...I don't think so.
Is this the first trailer you have hauled?
Let me know, and we will go from there.