Our lamppost went out last winter. Replaced the sensor and it still didn't work. Electrician came out, sniffed around the post and dug it up. The post had corroded and the sharp edges cut the wire to the lamp. They were able to free enough wire to splice it and put a waterproof covering on the splice. They also put some protection around the hole the wire enters the post to reduce the chance of another short. Lamp worked great for a week, then stopped working. I called them back and they determined the sensor was bad. Replaced it and the light has worked ever since.
BTW, our lamppost does not run through a ground fault circuit. We had to shut it down at the panel and the circuit included the garage lights and garage door opener as well as the outlets in the laundry room. What a pain opening and closing the garage door manually until I realized the outlets in the garage were still on. I ran a heavy duty extension cord to the opener so we could use it again.
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