Board Thread:Questions and Answers/@comment-150.101.206.114-20130717034734/@comment-13413401-20131201155902

Well, first of all, your not supposed to power it with redstone. Giving it a redstone signal will turn it off.

The type of power you need to give it is EU (Industrial Craft 2) or MJ (Buildcraft). If you are not familiar with these, I suggest you look at the wiki pages or watch videos about these two forms of energy and the mods. But, for starters, one good way to power the harvester is to place a solar panel right on top of it (assuming you are outside and there are no blocks stopping the sun from getting to the solar panel).