the tailights have nothing do do with the back up lights, they are on the same main fuse as the headlights, the headlights split into four circuits after the switch, the headlights and taillights have power coming into the switch from one 40 amp main fuse, then it splits into 1 circuit for the taillights and dash lights, and into two more circuits for low and high beams, those two circuits are split into four more fuses one for each low beam and high beam, the brake lights are on the horn fuse, the back up lights are on the gauge,instrument cluster fuse, the oil pressure is a different circuit.
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