Lightning-rod dream meaning is explained below using 3 different sources. Each interpretation is shown with its source.

Interpretation 1 — Gustavus Hindman Miller

To see a lightning-rod, denotes that threatened destruction to some cherished work will confront you.

To see one change into a serpent, foretells enemies will succeed in their schemes against you.

If the lightning strikes one, there will be an accident or sudden news to give you sorrow.

If you are having one put up, it is a warning to beware how you begin a new enterprise, as you will likely be overtaken by disappointment.

To have them taken down, you will change your plans and thereby further your interests.

To see many lightning rods, indicates a variety of misfortunes.

Source: Ten Thousand Dream Interpretation Author: Gustavus Hindman Miller

Interpretation 2 — Dream Explanations - Anonymous

Dreams of a lightening rod represent that you are becoming masterful in your abilities to direct energy and power into manifestation. You are becoming a more powerful vessel.
Source: Strangest Dream Explanations Author: Dream Explanations - Anonymous

Interpretation 3 — Martha Clarke

This dream warns you that you must be prudent to avoid disasters.
Source: The Big Dictionary of Dreams Author: Martha Clarke