[MikeDubreuil]

Please don't bump posts... we'll get to it eventually.

Originally Posted by Danielle H

If you're using a double ended solenoid, then you're going to want two seperate relays (one attached to each end) so that you can activate one after the other is deactivated. This will push the piston in the opposite direction.

You are incorrect, you do not need two relays to accomplish this.

Please see the Spike user manual for wiring instructions.