2002 Chevrolet Avalanche

Electrical problem
2002 Chevy Avalanche V8 Two Wheel Drive Automatic 13300 miles

the automatic headlight does not work at night and it will not come on manuel, but during the daytime it works and so does the daytime runnig lights most of the time. I swapt out the relays and all fuses dealing with the headlights, so my gues the sensor is bad but how do you get to it and which one is bad because they are 2 on the instrument panel

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