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The trailer light are connected to you vehicles wiring. Turn brake running. If the tail light are on on your vehicle you start checking wiring. If the tail lamps do not work check fuses in vehicle. If the trailer is hooked up and the fuse blows again check trailer. If it blows agin without trailer check vehicle wiring.
This seems to be pointing toward the alternator. When the fan is running, this can take a chunk of available current from the power supply. If possible, check the voltage across the battery when the engine is running. It should be up around 13.8 volts but doe this when you only have the engine running and no radio, fan or anything else switched on. If that's low, possibly 12 or lower, then the alternator needs either the connections checking for corrosion, the belt that it runs off tightening or replacing.
I would check fuel pressure before and after you crank the engine. The pump gets power for 3 seconds during startup - if the fuel pressure has leaked down you would have to crank the engine until the oil pressure came up to get the pump to power up again.