I doubt the likelyhood of an electrical open in the circuit as I have installed a few of them and had them not work and did nothing to them other than drive them on the rack while cycling the solenoid on and off. They all eventually started working and none of them have ever boomeranged. You'd think that if it was some nebulous open circuit somewhere in the wiring that 1. if it was indeed at the bullet that disconnecting the old and reconnecting the new would've rectified it and the new solenoid would've worked from the get go or 2. that if it was a case of an intermittant open that it would rear it's ugly little head down the road and boomerang on me. I really have not seen either one of these things happen. But like I said, I do not really have a good explanation for it either so you never know.

Mark