Because you experienced the problem right after the fence wire was installed it's probably likely that the installer cut the wire. Was the I.F. wire run between the house and lamp post? If yes, they most likely cut it.
Be very careful as the earlier poster said it's hard to tell which breaker the lamp post may be on. Be safe if you do the work and shut down the main breaker at the panel until you figure out which breaker is tied to the lamp post.
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